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USPTO Terms of Art — L

Glossary of USPTO Terms of Art

| A | B | C-CL | CM-CZ | D-DIM | DIM-DZ | E | F | G | H | I | J-K | L | M-MET | MET-MZ | N | O | P-PHA | PHE-PON | POR-PZ | Q | R | S-SEPA | SEPO-SMT | SN-STEM | STEP-SZ | T-TOG | TON-TZ | U | V | W | X-Z |

LAC (CLASS 428)
See natural oil, gum, rosin or lac below. (Nonstructural or Composition)

LACED-FASTENER* (CLASS 024)
A securing mechanism including both a string (i.e., a thin elongated flaccid* member) and guiding means (e.g., path defining eyelets) therefor located on two spaced edges of the structure-to-be-secured*; wherein the string (a) links together the guiding means on opposite sides of and traverses the gap between the edges, (b) draws the edges toward each other when a portion of the string is pulled past its guiding means to shorten the effective length of the remaining portion of the string traversing the gap, and (c) secures the edges in fixed relationship to each other when the extracted portion of the string is prevented from moving (e.g., tied).

LAGB (CLASS 438)
low-angle grain boundary

LAMINA (CLASS 156)
One of the component parts or layers of an adhesively bonded sandwich. Also an element which by disclosure is to be bonded to a separate element.

LAMPS (CLASS 315)
Are defined for the purpose of classification in this class as including a device designed for converting electrical energy into ray energy, regardless of whether the ray energy is within the visible or invisible part of the spectrum, but excluding (1) generators of X-rays, and (2) generators designed primarily to generate infrared rays. Lamps may be in the form of electric space discharge devices, for which see the next paragraph.

LAND (CLASS 257)
The conductive areas, normally metal patterns, on a semiconductor integrated circuit, which form part of the contacts and interconnections between components on the integrated circuit.

LAND (CLASS 438)
The conductive areas, normally metal patterns, on a semiconductor integrated circuit, which form part of the contacts and interconnections between components on the integrated circuit. See bonding pad, die bond.

LAND PATTERN (CLASS 257)
A combination of lands on an integrated circuit.

LANDING* (CLASS 187)
An in situ floor within a structure (e.g., building) located adjacent to an elevator shaft* and to or from which a load (e.g., passenger, cargo) transfers during the charging or discharging of the load-underlying support surface of an elevator.

LANGMUIR-BLODGETT FILM (CLASS 977)
Film of surfactant molecules on a liquid surface forming regular stacks (a multilayer) or can be only one molecule thick (a monolayer); may also be formed on solid surfaces.

LANGUAGE (CLASS 704)
A systematic means of communicating ideas or feelings by the use of conventionalized sounds, gestures, or marks having understood meanings.

LANTHANIDE ELEMENTS (CLASS 257)
La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho,Er, Tm, Yb, Lu.

LANTHANIDE* (CLASS 075)
A metal of the group Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Th), Ytterbium (Yb), and Lutetium (Lu).

LANTHANIDE* (CLASS 420)
An element of atomic number 57 to 71 inclusive.

LARGE OBJECTS (LOBs) (CLASS 707)
An object for storing a large amount of data within a database management system. Because of its size, it is sometimes stored external to a database management system, with the DBMS storing only references to the LOB. See also BLOBs.

LASER (CLASS 372)
A device for generating a very narrow, intense beam of coherent light. The name is derived from the initial letters of "Light Amplification by Stimulated Emission of Radiation". In the emission of ordinary light the molecules or atoms of the source emit their radiation independently of each other, and consequently there is no definite phase relationship among the vibrations in the resultant beam. The light is incoherent. The laser, by means of an optical resonator, forces the atoms of the material within the resonator to radiate in phase. The emitted radiation is stimulated by the excitation of atoms to a higher energy level by means of energy supplied to the device.

LAST (CLASS 425)
A form for shaping a shoe.

LATCH-OR LATCHING-BOLT (CLASS 070)
One normally yieldably biased or urged by some form of constantly present potential force to seek one position and operable to another position against such force, but automatically returnable to its original position unless restrained.

LATCHING/LATCHED/LATCHUP (CLASS 257)
The state or condition of a regenerative feedback device, e.g., a thyristor, in which the device remains ON when the initializing signal is removed.

LATERAL (CLASS 172)
A direction which is transverse of the line of draft of a tool over the earth unless some other meaning is clearly indicated by the context.

LATERAL (CLASS 226)
As used in this class, the term refers to that direction simultaneously perpendicular to the longitudinal* direction of movement of a web* and parallel to the surface of the web.

LATID (CLASS 438)
large angle tilt implant drain

LATTICE CONSTANT (CLASS 117)
Usually the edge length of a unit cell.

LAW OF A MACHINE (CLASS 425)
Control of sequential operations of machine parts by electrical or mechanical program means with operator control reduced to mere starting or stopping of operation of the machine.

LAYER (CLASS 112)
A single thickness of material or materials in the form of a panel, web, or sheet, or a plurality of any of these in side-by-side coplanar relation, or particulate material arranged in continuity to constitute a distinct stratum. A layer may include a plurality of components as in Figure 4. >

LAYER (CLASS 404)
Stratum, course, lamina, coating or sheet which is sufficiently recognizable as such regardless of the constituent material involved. Interface blending of otherwise distinct layers still leaves plural layers.

LAYER (CLASS 428)
A single thickness of material(s) in the form of web* or sheet*, or a plurality of any of these in side-by-side coplanar relation; or particulate material arranged in continuity to constitute a distinct stratum. A layer may include a plurality of components* as in Figure 2. See also (2) Note under A, above. (Structural) >

LAYER* (CLASS 349)
For the purpose of this class, a layer is a periodic discontinuous material or materials within a single plane having a single function, or a continuous material having one or more functions.

LB (CLASS 438)
(a) Langmuir-Blodgett or (b) laser beam

LC RESONATOR (CLASS 331)
A resonant circuit comprising separate inductance and capacitance elements, i.e., lumped inductor and capacitor elements.

LCCC (CLASS 257)
An abbreviation for a leadless ceramic chip carrier which is a hermetically-sealable ceramic package in which an integrated chip can be placed to create a surface mounted component. It has pads around its perimeter for connection to a substrate.

LCCD (CLASS 438)
leadless ceramic chip carrier

LCD (CLASS 438)
liquid crystal display

LDCC (CLASS 438)
leaded ceramic chip carrier

LDD (CLASS 438)
lightly doped drain

LEACHING (CLASS 423)
The process of extracting or dissolving a soluble component from a mixture by contacting the mixture with a solvent, resulting in dissolution or solution of the solubles and leaving an insoluble material. (Note. Solution of a substance in a normally solid, molten material is not considered to be "leaching" as defined above.)

LEACHING (CLASS 588)
The processes of extracting or dissolving a soluble component from a mixture by contacting the mixture with a solvent, resulting in dissolution or solution of the solubles and leaving an insoluble material. Note. Solution of a substance in a normally solid, molten material is not considered to be leaching as defined above.

LEAD (CLASS 257)
The conductor brought out from a component.

LEAD FRAME (CLASS 257)
A metal frame which provides support for an integrated circuit chip or die as well as electrical leads to interconnect the integrated circuit on the die or chip to other electrical components or contacts.

LEAD-IN (CLASS 313)
The conductor used to transmit electric current or potential from the exterior of the envelope or casing into the interior of the envelope or casing. Where the envelope is made of glass it usually consists of a conductor which passes through the wall of the envelope and which is sealed to the glass by a glass-to-metal seal.

LEAF (CLASS 016)
A rod or platelike portion by which the hinge is adapted to be secured to a hinged member*.

LEAF (CLASS 281)
A sheet other than a strip.

LEAF (CLASS 283)
A sheet other than a strip.

LEAF (CLASS 462)
A sheet* other than a strip*.

LEAF SPRING (CLASS 267)
an element comprising a plate or bar or a plurality of superposed plates or bars and which exhibits resilient characteristics when a portion is deflected transversely of length of the element

LEAKAGE CURRENT (CLASS 257)
Unwanted current flow.

LEC (CLASS 117)
Liquid Encapsulated Czochralski (CZ*) method.

LEC (CLASS 438)
liquid encapsulated Czoshralski

LECHER LINES (CLASS 330)
A parallel transmission line with means to tune the parallel line.

LED (CLASS 438)
light emitting diode

LEED (CLASS 438)
low-energy electron diffraction

LEK (CLASS 438)
liquid encapsulated Kyropoulus

LENS (CLASS 351)
Ophthalmic lens or transparent material in goggles unless otherwise indicated.

LENS REPAIR DEVICES (CLASS 351)
Structure embracing the broken portion of a lens by a metal or plastic strip so that the lens can be restored to the mounting.

LEVER (CLASS 049)
An elongated rigid arm which is pivoted at least one point along its length.

LIBRARY (CLASS 506)
A library is a created collection of a plurality of compounds, micro-organisms, or other substances. The collection is useful as a test vehicle for determining which of its members or its subsets of members possess activities or properties of interest. A library might, for example, exist as (a) a solution, (b) a physical admixture, (c) an ordered or unordered array, or (d) a plurality of members present on a support and affixed thereto (e.g., by chemical bonding, physical attractive forces, coating, etc.).

LIFETIME (CLASS 257)
The average time interval between the introduction of and recombination of minority charge carriers in a semiconductor.

LIFT-OFF (CLASS 438)
Process for the removal of unwanted deposited material from a substrate (and thus patterning the same) by the dissolution of an intermediate layer and the commitant physical separation of the overlying deposited material.

LIGHT (CLASS 372)
In this class, light includes not only optical wavelengths, i.e., that part of the spectrum extending from the near infrared, through the visible, to the ultraviolet, but also includes those portions of the spectrum which extends from the near infrared through the long wavelength, far infrared, and from the ultraviolet to X-rays and gamma rays at the shortest wavelengths.

LIGHT EMITTING DIODE (LED) (CLASS 257)
Junction diodes which give off light when energized.

LIGHT FLUX (CLASS 396)
Light flux is the rate of light flow across a surface.

LIGHT METAL (CLASS 532)
This term denotes any metal having a specific gravity less than four.

LIGHT METAL* (CLASS 075)
A metal of the group Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr), Calcium (Ca), Strontium (Sr), Barium (Ba), Radium (Ra), Beryllium (Be), Magnesium (Mg), and Aluminum (Al).

LIGHT METALS (CLASS 257)
Alkali metals, alkaline-earth metals, Be, Al, Mg.

LIGHT PARALLELING STRUCTURE (CLASS 353)
Optical elements for directing the light from the concentrated light source so that it impinges on the object perpendicular to the plane of the object and uniformly illuminates the object to be projected.

LIGHT POLARIZING LENSES (CLASS 351)
Lenses comprising a polarizing element which reduces light losses due to reflection.

LIGHT SOURCE (CLASS 355)
The source of illumination for the copier. It includes filters, reflectors, screens and other light modifiers used to affect the spectral distribution, spatial distribution and intensity of the illumination.

LIGHT SOURCE (CLASS 362)
An element (e.g., filament) or material (e.g., neon) which converts energy into visible radiant energy and/or the essential container of such an element or material, i.e., a light source envelope including the envelope base (e.g., light bulb, fluorescent tube). Unless otherwise specified, a light source is assumed to be a point source. For purposes of classification within this class, nominal recitations such as "light unit," "lamp," "headlight," etc., are assumed to denote only a light source.

LIGHT SOURCE (CLASS 399)
The source of illumination for the copier. The light source includes filters, reflectors, screens, and other light modifiers used to affect the spectral distribution, spatial distribution, and intensity of the illumination.

LIGHT TRANSMITTING ROD (CLASS 385)
Any optically transparent elongated structure used to transmit light from one end to the other end by other than modal transmission (e.g., in a random fashion).

LIGHT, VISIBLE LIGHT (CLASS 356)
Visible light is radiation, which stimulates the optical receptors of the eye, and has a wavelength from 3850 to 7600 Angstrom units. The term light in these definitions refers to radiation in the above mentioned range, and when qualified by the terms ultraviolet and infrared refers to the corresponding radiation ranges adjacent the visible range.

LIGHT, VISIBLE LIGHT (CLASS 359)
Visible light is radiation which stimulates the optical receptors of the eye and has a wavelength from 3850 to 7600 Angstrom units. The term light is used to refer to wavelengths in the above mentioned range and, often, also to refer to the ranges immediately adjacent, i.e., the ultra violet and infrared ranges which are nonvisible.

LIGHT, VISIBLE LIGHT (CLASS 372)
Visible light is radiation which stimulates the optical receptors of the eye, and having a wavelength from 3850 to 7600 Angstrom units. The term light is used to refer to wavelengths in the above-mentioned range and, often, also to refer to the ranges immediately adjacent, i.e., the ultraviolet and infrared ranges which are nonvisible.

LIGNIN (CLASS 510)
Denotes a material usually derived during paper pulp manufacture by separation of the cellulose from wood. Lignin is considered to be the binder for cellulose in wood. Lignin includes crude mixtures of lignose, lignone, and lignin. Lignin, per se, is a complex structure having some aromatic rings and phenolic groups.

LIGNIN (CLASS 520)
Denotes a material usually derived during paper pulp manufacture by separation of the cellulose from wood. Lignin is considered to be the binder for cellulose in wood. Lignin includes crude mixtures of lignose, lignone and lignin. Lignin per se is a complex structure having some aromatic rings and phenolic groups.

LIGNIN DERIVATIVE (CLASS 520)
Denotes materials not otherwise provided for, derived from lignin or from sulfite or soda paper pulping processes, e.g., sodium lignosulfonate, waste sulfite liquor, black liquor, etc.

LINE CIRCUIT (CLASS 363)
The main power path between the source and the load.

LINE DEFECT (CLASS 257)
A planar crystal defect (e.g., an extra plane of atoms in a crystal). It is also called an edge dislocation.

LINE-SPACE (CLASS 400)
The distance caused by relative movement between a record-medium* and a print-point* of a type-member* against the record-medium, which movement effects separation of one print-line* of typed text from a subsequently imprinted line of typed text on the same page* of text. It is effected by incremental relative movement that occurs in a direction perpendicular to the direction in which a print-line is formed. In most typewriters the type- member is impressed in substantially the same area of the typewriter and the record-medium is effectively held to a platen* which moves incrementally between successive print-lines, but in some typewriters the type-member and its actuating mechanism moves in a corresponding direction in incremental movements between successive print-lines. Thus, in most typewriters, line-space movement is a specific form of record-medium movement, but line-space movement is a determinate, incremental movement in selected units of distance or in multiples or fractions thereof. If a unit of distance is considered as one line-space, the multiples would include two or three line-spaces and the fractions would include one-half, one and one-half, or two and one-half line-spaces, all these distances being selected by the user of a typewriter according to the needs of the user. The most significant aspect of line-space movement is that it is related to a preceding or succeeding print-line on the record-medium as distinguished from record-medium movement which is not related to a print-line, but rather is an indeterminate movement.

LINEAR MOVEMENT MOTORS (CLASS 318)
A motor having means for causing the working element to move in a substantially linear or uni-directional path. The path may be straight, curved, tortuous, or even closed upon itself, provided the movable element is not pivoted for rotation about an axis. The motor may have means for reversing the direction of movement of the movable element. Where the reversing means includes means for periodically or repeatedly reversing the motor at predetermined intervals, the motor system is considered to be an oscillating or reciprocating motor system. See the Glossary definition of Oscillating Or Reciprocating Motor.

LINER (CLASS 166)
A column of casing having screen forming perforations which does not extend to the top of the well and which is usually the lowest column of casing in the well. The liner is placed in position by lowering it from the top of the well through the casing sections already placed in well. The perforations may be formed before the liner is run into the well or after. The liner is sometimes surrounded by a perforated section of casing, the liner then becoming a secondary lining section of the well.

LINGUISTICS (CLASS 704)
The study of human speech including the units, nature, structure, and modification of language.

LINING(*) (CLASS 412)
The material used for or process of reinforcing the back(*) of a bound book(*) by gluing a strip of the material to the back(*) of the book.

LINK (CLASS 049)
A type of lever which is pivoted at two or more points along its length, usually at its extremities.

LIPID (CLASS 977)
Water-insoluble organic substances naturally found in cells that are extractable by nonpolar solvents such as chloroform, ether, or benzene. Lipids generally serve four general functions: (1) as structural components of membranes; (2) as intracellular storage depots of metabolic fuel; (3) as a transport form of metabolic fuel; and (4) as protective components of cell walls of many organisms. Some examples of natural lipids are long-chain fatty acids, fatty acid esters, acylglycerols, phosphoglycerides, steroids, waxes, terpenes, and fat-soluble vitamins.

LIPOSOME (CLASS 977)
Particle with a lipid-containing outer wall that has an interior space that may contain various molecule types.

LIQUID (CLASS 210)
A flowable material comprising at least one component that is a true liquid under the conditions of treatment. A slurry, wet sludge, pumpable sediment, emulsion, froth, all are considered liquid for treatment in this class.

LIQUID (CLASS 510)
Denotes a shapeless, fluid composition of high incompressibility. Included herein are pumpable or flowable slurries or suspensions.

LIQUID SORBENT (CLASS 095)
A liquid capable of retaining part of a fluid mixture with which it is contacted. The action in most cases is that of selective retention (i.e., the sorbent removes only that part of the fluid mixture for which it has the greatest affinity).

LIQUID SORBENT (CLASS 096)
A liquid capable of retaining part of a fluid mixture with which it is contacted. The action in most cases is that of selective retention (i.e., the sorbent removes only that part of the fluid mixture for which it has the greatest affinity).

LIQUID-LIQUID EXTRACTION (CLASS 423)
The process of transferring a substance (fluid or solid) from one liquid phase in which it is dispersed or dissolved to a second liquid phase which is immiscible with the first liquid.

LIQUID-PHASE SYNTHESIS (CLASS 506)
This terminology covers both solution-phase syntheses (i.e., reactions involving only one liquid phase) as well as syntheses in multiple liquid-phase systems (i.e., involving more than one liquid phase). The latter is concerned with syntheses performed on a liquid macromolecular compound such as polyethylene glycol (PEG), on dendrimers, or wherein a fluorocarbon phase is present in the system (fluorous synthesis).

LIVE (CLASS 707)
Live is used in the definitions to distinguish between Active. A live database is online, is responding to transactions (e.g., it is receiving updates) and can be in use by users, for example, is responsive to queries.

LOAD (CLASS 330)
The electric device or circuit which utilizes the output signal derived from the amplifier after the input signal has controlled the electric power supply by means of the amplifying device to yield a signal which is a replica of the input signal but usually of greater amplitude.

LOAD (CLASS 388)
That device, or system, which is the recipient of the mechanical work output of an electric motor.

LOAD CIRCUIT (CLASS 322)
Includes the system into which the electric energy from the electric generator is supplied, and may include a load device recited broadly or by name only (such as a welding load) in some cases. See Lines With Other Classes and Within This Class, above.

LOAD CIRCUIT (CLASS 323)
The output terminals which are to be connected to a device which is to be supplied with electrical energy.

LOAD DEVICE (CLASS 315)
The device to which the system supplies electrical energy and which, as claimed, constitutes the final or ultimate device for utilizing the electrical energy of the system.

LOAD DEVICE (CLASS 475)
Mechanism which receives rotational power from an output member* to put such rotational power to useful work.

LOAD LASHING RETAINER (CLASS 410)
Retainer which includes flaccid material accommodating means, the virtue of the flaccidity being in its infinite deflective capacity so that the means can (inter alia) (a) closely conform to exterior configurations of load units, (b) extend in guided changes in direction from the locus of securement to the freight carrier to that of the retentive engagement with the load unit, and (c) most particularly, under subjection to force multiplying means, be so tightly engaged with the load unit, and over such critical configurations of the load unit surface that the engagement of this nature constitutes load unit retention. A load lashing retainer may consist of a combination of rigid material and flaccid material elements provided that the flaccid material element (or member) is significant in the combination. Significance is present when the flaccid material element member is used (a) to attach the load lashing retainer to the freight carrier or retentively to connect with the load unit, or (b) to extend between the freight carrier attachment member and load unit securement member (one or both of which members are rigid) to impart to the load lashing retainer made up of these members unique advantages of flaccidity described in the preceding paragraph. Not all flaccid load unit accommodating relationships are, in fact, retentive. Tight encirclement of the load (i.e., wraparound lashing) tautened engagement with the load under the effect of force multiplying means, and a tiedown (defined hereinbelow) do, however, invariably accomplish load lashing retention.

LOAD-BEARING (CLASS 052)
A construction or component which is sufficiently strong and rigid to act as the primary support for other constructions or components against gravity or to resist transverse loading (see sustainer).

LOAD, LOAD DEVICE, OR LOAD CIRCUIT (CLASS 320)
Any electrical device for usefully converting or consuming electrical energy other than those devices which are merely accessory, auxiliary, or appurtenant to the source and/or the circuit which supplies electric energy. [An accessory or auxiliary device is a device used to affect operation, control, or care of a source and/or supply circuit and may, for example, comprise a device employed: (i) to test, indicate, or measure a condition of or in a source or supply circuit, or (ii) to regulate or control the flow of electric energy from or through the source or supply circuit.]

LOAD: (CLASS 477)
Mechanism that receives rotational motion from a gear transmission* or clutch* to do useful work.

LOADED ANTENNA (CLASS 343)
An active antenna having an elongated portion of appreciable electrical length and having additional inductance or capacity directly in series or shunt with the elongated portion so as to modify the standing wave pattern existing along the portion or to change the effective electrical length of the portion.

LOADED LINES (CLASS 333)
A long line to which lumped impedance elements, usually capacitors or inductors, are added at regularly spaced points along the length thereof, or to which an added impedance is applied in a continuous manner, as for example, by wrapping a strip of magnetic material about the line or device to increase the inductance of the line or device.

LOCAL AREA NETWORK (LAN) (CLASS 370)
A relatively short distance data communication network linking computers and other devices utilizing some type of standard control.

LOCAL OSCILLATOR (CLASS 725)
An oscillator in a superheterodyne circuit whose output is mixed with the received signal to produce a sum or difference frequency equal to the intermediate frequency of the receiver.

LOCAL OXIDE CMOS (LOCMOS) (CLASS 257)
Local oxide complementary metal oxide semiconductor structure which features oxide isolation which is recessed into the semiconductor surface.

LOCKING MEANS* (CLASS 024)
A component having the sole function of restricting the movement between and holding in a particular position or orientation (e.g., not moving or reorienting) either (1) one portion of the fastener relative to another portion of the fastener, or (2) one fastener relative to another fastener.

LOCOS (CLASS 257)
(Local Oxidation of Silicon) Patterns of oxide isolation which are recessed into the semiconductor surface. Sometimes also called isoplanar, ROX (Recessed Oxide Isolation), or planox.

LOCOS (CLASS 438)
local oxidation of silicon

LOG (CLASS 144)
A longitudinal section cut from a tree*, generally cut normal thereto at both ends.

LOG (SEE ALSO JOURNAL) (CLASS 707)
A historical record of transactions and activities related to the database or file system.

LOGIC (CLASS 326)
The science dealing with the basic principles and applications of truth tables, Boolean algebra, etc.

LONG LINE (CLASS 330)
A wave transmission device or line having distributed parameters and especially designed to propagate electrical wave energy where the wave length of the transmitted energy is relatively short when compared with the length of the transmission line or device. The impedance of a long line is practically fixed by the constants of the line itself. The length of the transmission line or device may be a multiple or a fraction of a wave length, e.g., 1/4, 1/2, etc., or otherwise have its length proportioned to the wave length of the energy with which it is to be used.

LONG LINE (CLASS 333)
A wave transmission device or line having distributed parameters and especially designed to propagate electrical wave energy where the wave length of the transmitted energy is relatively short when compared with the length of the transmission line or device. The impedance of a long line is practically fixed by the constants of the line itself. The length of the transmission line or device may be a multiple or a fraction of a wave length, e.g., 1/4, 1/2, etc., or otherwise have its length proportioned to the wave length of the energy with which it is to be used.

LONG LINE ELEMENT (CLASS 330)
A circuit element having distributed parameters, such as a resonator, or a wave guide. A long line element may be a part of a long line wave transmission device or used in a network with other circuit elements of the lumped parameter type, for example, as in the case of delay networks, impedance matching networks, wave filters.

LONG LINE ELEMENT (CLASS 333)
A circuit element having distributed parameters, such as a resonator, or a wave guide. A long line element may be a part of a long line wave transmission device or used in a network with other circuit elements of the lumped parameter type, for example, as in the case of delay networks, impedance matching networks, wave filters.

LONGITUDINAL (CLASS 172)
A direction which is parallel to the line of draft of a tool over the earth unless some other meaning is clearly indicated.

LONGITUDINAL (CLASS 226)
As used in this class, the term refers to the direction along the length of the indeterminate-length* material.

LOOP (CLASS 352)
A slack portion of a motion picture film strip useful to isolate tensionally derived speed variations.

LOOP PATH (CLASS 330)
In an amplifier having signal feedback, the path of the signal from the input point where the signal feedback is applied forward through the amplifier to the point in the circuit from which the signal feedback is derived through the signal feedback path to the aforesaid input point.

LOPED (CLASS 438)
lift-off using edge detection

LOW WORK FUNCTION ELECTRODE (cold cathode, cathodes containing or coated with electron emissive material) (CLASS 313)
A cathode containing or coated with a material which readily emits electrons, i.e., a material which has a low work function. Examples of such materials are the alkali metals and their oxides, alkaline earth metals and their oxides, thorium, magnesium. The expression "low work function electrode" includes thermionic electrodes which contain or are coated with electron emissive material, photosensitive cathodes, secondary emissive cathodes as well as cathodes which emit electrons without being heated.

LOWER-CASE (CLASS 400)
A "small" letter, similar in appearance to this text, as opposed to upper-case*. The names lower-case and upper-case are derived from the printing art during the period when type-faces* were handpicked and handset, the type being picked from a tray in which the capital or upper-case type were held in compartments physically located above the compartments for the small or lower-case type.

LPCVD (CLASS 438)
low-pressure chemical vapor deposition

LPE (CLASS 438)
liquid phase epitaxy

LRP (CLASS 438)
limited reaction processing

LSI (CLASS 438)
large scale integration

LSSL (CLASS 438)
lateral surface superlattice

LST (CLASS 438)
logic service terminal

LTCC (CLASS 438)
low temperature co-fired ceramic

LTG (CLASS 438)
low temperature growth

LTO (CLASS 438)
low temperature oxidation

LUMBER (CLASS 144)
Building material cut from a tree*, generally cut from a log*, generally without bark*.

LUMINESCENCE (CLASS 257)
Emission of light by directly converting some other type of energy. Types include thermoluminescence, photoluminescence, cathodoluminescence, and electroluminescence. It includes fluorescence and phosphorescence. Active solid-state luminescent devices are semiconductors which operate via injection luminescence. Active devices include pn junctions (including heterojunctions), Schottky barrier junctions, metal-insulator-semiconductor (MIS) structures, and high speed traveling domains, e.g., Gunn domain and acoustoelectric wave generated domains; whereas passive solid-state electroluminescent devices (phosphors) are insulators which operate in an intrinsic luminescence phenomena, i.e., where an applied electric field generates free carriers (there being no free carriers in an insulator to be accelerated by an applied field unless the field also generates them) to initiate the light emission mechanism.

LUMINESCENCE (CLASS 438)
The emission of visible or invisible radiation unaccompanied by high temperature by any substance as a result of absorption of exciting energy in the form of photons, charged particles, or chemical change. It is a general term which includes fluorescence and phosphorescence. Types include hemiluminescence, bioluminescence, photoluminescence, electroluminescence, photoluminescence, and triboluminescence. Active solid-state luminescent devices are semiconductors which operate via injection luminescence. Active devices include pn junctions (including heterojunctions), Schottky barrier junctions, metal-insulator-semiconductor (MIS) structures, and high speed traveling domains (e.g., Gunn domain and acoustoelectric wave generated domains). Passive solid-state electroluminescent devices (phosphors) are insulators which operate in an intrinsic luminescence phenomena (i.e., where an applied electric field generates free carriers) to initiate the light emission mechanism, there being no free carriers in an insulator to be accelerated by an applied field unless the field also generates them.

LUMPED PARAMETERS OR IMPEDANCES (CLASS 333)
When the impedance of a transmission line or device at the operating frequency may be considered as equivalent to devices concentrated at one point, and the parameters of the system including the line or device is not substantially independent of the load devices connected thereto, the transmission line or device may be said to have lumped parameters. Lumped impedances is also used to include devices such as capacitors, inductors, and resistors which have their impedance concentrated at the terminals thereof.

| A | B | C-CL | CM-CZ | D-DIM | DIM-DZ | E | F | G | H | I | J-K | L | M-MET | MET-MZ | N | O | P-PHA | PHE-PON | POR-PZ | Q | R | S-SEPA | SEPO-SMT | SN-STEM | STEP-SZ | T-TOG | TON-TZ | U | V | W | X-Z |

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