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A
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SECTION A — HUMAN NECESSITIES
B
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SECTION B — PERFORMING OPERATIONSTRANSPORTING
C
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SECTION C — CHEMISTRYMETALLURGY
D
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SECTION D — TEXTILESPAPER
E
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SECTION E — FIXED CONSTRUCTIONS
F
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SECTION F — MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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SECTION G — PHYSICS
H
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SECTION H — ELECTRICITY
H01
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BASIC ELECTRIC ELEMENTS
H02
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GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03
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BASIC ELECTRONIC CIRCUITRY
H03B
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GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNERGENERATION OF NOISE BY SUCH CIRCUITS (measuring, testing G01R; generators adapted for electrophonic musical instruments G10H; speech synthesis G10L 13/00; masers, lasers H01S; dynamo-electric machines H02K; power inverter circuits H02M; by using pulse techniques H03K; automatic control of generators H03L; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; generation of oscillations in plasma H05H)
H03C
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MODULATION (measuring, testing G01R; masers, lasers H01S; modulators specially adapted for use in dc amplifiers H03F 3/38; modulating pulses H03K 7/00; so-called modulators capable only of switching between predetermined states of amplitude, frequency or phase H03K 17/00, H04L; coding, decoding or code conversion, in general H03M; synchronous modulators specially adapted for colour television H04N 9/65)
H03D
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DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K 9/00; transforming types of pulse modulation H03K 11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B 7/14; demodulators adapted for digitally modulated-carrier systems H04L 27/00; synchronous demodulators adapted for colour television H04N 9/66)
H03F
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AMPLIFIERS (measuring, testing G01R; optical parametric amplifiers G02F; circuit arrangements with secondary emission tubes H01J 43/30; masers, lasers H01S; dynamo-electric amplifiers H02K; control of amplification H03G; coupling arrangements independent of the nature of the amplifier, voltage dividers H03H; amplifiers capable only of dealing with pulses H03K; repeater circuits in transmission lines H04B 3/36, H04B 3/58; application of speech amplifiers in telephonic communication H04M 1/60, H04M 3/40)
H03G
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CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H03H; control of transmission in lines H04B 3/04)
H03H
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IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITSRESONATORS (measuring, testing G01R; arrangements for producing a reverberation or echo sound G10K 15/08; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H01P; control of amplification, e.g. bandwidth control of amplifiers, H03G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H03J; networks for modifying the frequency characteristics of communication systems H04B)
H03H 1/00
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Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers H03H 9/00)
H03H 2/00
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Networks using elements or techniques not provided for in groups H03H 3/00-H03H 21/00 [3]
H03H 3/00
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Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
H03H 5/00
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One-port networks comprising only passive electrical elements as network components [3]
H03H 7/00
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Multiple-port networks comprising only passive electrical elements as network components (receiver input circuits H04B 1/18; networks simulating a length of communication cable H04B 3/40) [3]
H03H 9/00
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Networks comprising electromechanical or electro-acoustic elementsElectromechanical resonators (manufacture of piezo-electric or magnetostrictive elements H01L 41/00; loudspeakers, microphones, gramophone pick-ups or the like H04R)
H03H 9/02
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Details [3]
H03H 9/05
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. . HoldersSupports [3]
H03H 9/08
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. . . Holders with means for regulating temperature
H03H 9/09
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. . . Elastic or damping supports [3]
H03H 9/10
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. . . Mounting in enclosures
H03H 9/12
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. . . . for networks with interaction of optical and acoustic waves
H03H 9/125
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. . Driving means, e.g. electrodes, coils [3]
H03H 9/13
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. . . for networks consisting of piezo-electric or electrostrictive materials (H03H 9/145 takes precedence) [3]
H03H 9/135
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. . . for networks consisting of magnetostrictive materials (H03H 9/145 takes precedence) [3]
H03H 9/145
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. . . for networks using surface acoustic waves [3]
H03H 9/15
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Constructional features of resonators consisting of piezo-electric or electrostrictive material (H03H 9/25 takes precedence) [3]
H03H 9/17
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. . having a single resonator (crystal tuning forks H03H 9/21) [3]
H03H 9/19
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. . . consisting of quartz [3]
H03H 9/205
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. . having multiple resonators (crystal tuning forks H03H 9/21) [3]
H03H 9/21
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. . Crystal tuning forks [3]
H03H 9/215
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. . . consisting of quartz [3]
H03H 9/22
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Constructional features of resonators consisting of magnetostricitve material
H03H 9/24
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Constructional features of resonators of material which is not piezo-electric, electrostrictive, or magnetostrictive
H03H 9/25
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Constructional features of resonators using surface acoustic waves [3]
H03H 9/30
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Time-delay networks
H03H 9/36
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. . with non-adjustable delay time (H03H 9/40, H03H 9/42 take precedence) [3]
H03H 9/38
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. . with adjustable delay time (H03H 9/40, H03H 9/42 take precedence) [3]
H03H 9/40
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. . Frequency-dependent delay lines, e.g. dispersive delay lines (H03H 9/42 takes precedence) [3]
H03H 9/42
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. . using surface acoustic waves [3]
H03H 9/44
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. . . Frequency-dependent delay lines, e.g. dispersive delay lines [3]
H03H 9/46
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Filters (multiple-port electromechanical filters H03H 9/70) [3]
H03H 9/48
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. . Coupling means therefor [3]
H03H 9/50
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. . . Mechanical coupling means [3]
H03H 9/52
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. . . Electric coupling means [3]
H03H 9/54
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. . comprising resonators of piezo-electric or electrostrictive material (H03H 9/64 takes precedence) [3]
H03H 9/56
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. . . Monolithic crystal filters [3]
H03H 9/58
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. . . Multiple crystal filters [3]
H03H 9/60
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. . . . Electric coupling means therefor [3]
H03H 9/62
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. . comprising resonators of magnetostrictive material (H03H 9/64 takes precedence) [3]
H03H 9/64
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. . using surface acoustic waves [3]
H03H 9/66
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Phase shifters [3]
H03H 9/68
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. . using surface acoustic waves [3]
H03H 9/70
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Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common or source [3]
H03H 9/72
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. . Networks using surface acoustic waves [3]
H03H 9/74
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Multiple-port networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source (networks for phase shifting H03H 9/66) [3]
H03H 9/76
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. . Networks using surface acoustic waves [3]
H03H 11/00
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Networks using active elements
H03H 15/00
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Transversal filters (electromechanical filters H03H 9/46, H03H 9/70) [3]
H03H 17/00
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Networks using digital techniques [3]
H03H 19/00
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Networks using time-varying elements, e.g. N-path filters [3]
H03H 21/00
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Adaptive networks [3]
H03J
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TUNING RESONANT CIRCUITSSELECTING RESONANT CIRCUITS (indicating arrangements for measuring G01D; measuring, testing G01R; remote-control in general G05, G08; automatic control or stabilisation of generators H03L)
H03K
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PULSE TECHNIQUE (measuring pulse characteristics G01R; mechanical counters having an electrical input G06M; information storage devices in general G11; sample-and-hold arrangements in electric analogue stores G11C 27/02; construction of switches involving contact making and breaking for generation of pulses, e.g. by using a moving magnet, H01H; static conversion of electric power H02M; generation of oscillations by circuits employing active elements which operate in a non-switching manner H03B; modulating sinusoidal oscillations with pulses H03C, H04L; discriminator circuits involving pulse counting H03D; automatic control of generators H03L; starting, synchronisation, or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) [4]
H03L
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AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators H02P) [3]
H03M
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CODING, DECODING OR CODE CONVERSION, IN GENERAL (using fluidic means F15C 4/00; optical analogue/digital converters G02F 7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) [4]
H04
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ELECTRIC COMMUNICATION TECHNIQUE
H05
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ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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