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SECTION H — ELECTRICITY

H 01

 BASIC ELECTRIC ELEMENTS

H 01 B

 CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING, OR DIELECTRIC PROPERTIES (selection for magnetic properties H 01 F 1/00; waveguides H 01 P; installation of cables or lines, or of combined optical and electric, cables or lines H 02 G)

H 01 C

 RESISTORS

H 01 F

 MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (ceramics based on ferrites C 04 B 35/26; alloys C 22 C; thermomagnetic devices H 01 L 37/00; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H 04 R) [2]

H 01 G

 CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H 01 B 3/00; capacitors with potential-jump or surface barrier H 01 L 29/00)

H 01 H

 ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H 01 B 7/10; overvoltage protection resistors, resistive arresters H 01 C 7/12, H 01 C 8/04; electrolytic self-interrupters H 01 G 9/18; switching devices of the waveguide type H 01 P; devices for interrupted current collection H 01 R 39/00; overvoltage arresters using spark gaps H 01 T 4/00; emergency protective circuit arrangements H 02 H; switching by electronic means without contact-making H 03 K 17/00)

H 01 J

 ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H 01 T; arc lamps with consumable electrodes H 05 B; particle accelerators H 05 H)

H 01 K

 ELECTRIC INCANDESCENT LAMPS (details or apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H 01 J; light sources using a combination of incandescent and other types of light generation H 01 J 61/96, H 05 B 35/00; circuits therefor H 05 B)

H 01 L

 SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR (conveying systems for semiconductor wafers B 65 G 49/07; use of semiconductor devices for measuring G 01; resistors in general H 01 C; magnets, inductors, transformers H 01 F; capacitors in general H 01 G; electrolytic devices H 01 G 9/00; batteries, accumulators H 01 M; waveguides, resonators, or lines of the waveguide type H 01 P; line connectors, current collectors H 01 R; stimulated-emission devices H 01 S; electromechanical resonators H 03 H; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H 04 R; electric light sources in general H 05 B; printed circuits, hybrid circuits, casings or constructional details of electrical apparatus, manufacture of assemblages of electrical components H 05 K; use of semiconductor devices in circuits having a particular application, see the subclass for the application) [2]

H 01 M

 PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY (electrochemical processes or apparatus in general C 25; semiconductor or other solid state devices for converting light or heat into electrical energy H 01 L, e.g. H 01 L 31/00, H 01 L 35/00, H 01 L 37/00) [2]

H 01 P

 WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G 02 B; aerials H 01 Q; networks comprising lumped impedance elements H 03 H)

H 01 Q

 AERIALS (microwave radiators for near-field therapeutic treatment A 61 N 5/04; apparatus for testing aerials or for measuring aerial characteristics G 01 R; waveguides H 01 P; radiators or aerials for microwave heating H 05 B 6/72)

H 01 R

 LINE CONNECTORS; CURRENT COLLECTORS (switches, fuses H 01 H; coupling devices of the waveguide type H 01 P 5/00; switching arrangements for the supply or distribution of electric power H 02 B; installations of electric cables or lines, or of combined optical and electric cables or lines, or of auxiliary apparatus H 02 G; printed means for providing electric connections to or between printed circuits H 05 K)

H 01 S

 DEVICES USING STIMULATED EMISSION

H 01 T

 SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (working of metal by the action of a high concentration of electric current B 23 H; welding, e.g. arc welding, electron beam welding or electrolytic welding, B 23 K; gas-filled discharge tubes with solid cathode H 01 J 17/00; electric arc lamps H 05 B 31/00)

H 02

 GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER

H 02 B

 BOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER (basic electric elements, their assembly, including the mounting in enclosures or on bases, or the mounting of covers thereon, see the subclasses for such elements, e.g. transformers H 01 F, switches, fuses H 01 H, line connectors H 01 R; installation of electric cables or lines, or of combined optical and electric cables or lines, or other conductors for supply or distribution H 02 G)

H 02 G

 INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES (distribution points incorporating switches H 02 B; guiding telephone cords H 04 M 1/15; cable ducts or mountings for telephone or telegraph exchange installations H 04 Q 1/06)

H 02 H

 EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G 01 R, e.g. G 01 R 31/00, G 08 B; locating faults along lines G 01 R 31/08; emergency protective devices H 01 H)

H 02 J

 CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY (power supply circuits for apparatus for measuring X-radiation, gamma radiation, corpuscular radiation or cosmic radiation G 01 T 1/175; for digital computers G 06 F 1/18; for discharge tubes H 01 J 37/248; circuits or apparatus for the conversion of electric power, arrangements for control or regulation of such circuits or apparatus H 02 M; interrelated control of several motors, control of a prime-mover/generator combination H 02 P; control of high-frequency power H 03 L ; additional use of power line or power network for transmission of information H 04 B)

H 02 K

 DYNAMO-ELECTRIC MACHINES (measuring instruments G 01; dynamo-electric relays H 01 H 53/00; conversion of dc or ac input power into surge output power H 02 M 9/00; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H 04 R)

H 02 M

 APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (systems for regulating electric or magnetic variables in general, e.g. using transformers, reactors or choke coils, combination of such systems with static converters G 05 F; for digital computers G 06 F 1/00; transformers H 01 F; connection or control of one converter with regard to conjoint operation with a similar or other source of supply H 02 J; dynamo-electric converters H 02 K 47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H 02 P; pulse generators H 03 K) [4,5]

H 02 N

 ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR

H 02 P

 CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS (structure of the starter, brake, or other control devices, see the relevant subclasses, e.g. mechanical brake F 16 D, mechanical speed regulator G 05 D, variable resistor H 01 C, starter switch H 01 H; systems for regulating electric or magnetic variables using transformers, reactors or choke coils G 05 F; arrangements structurally associated with motors, generators, dynamo-electric converters, transformers, reactors or choke coils, see the relevant subclasses, e.g. H 01 F, H 02 K; connection or control of one generator, transformer, reactor, choke coil, or dynamo-electric converter with regard to conjoint operation with similar or other source of supply H 02 J; control or regulation of static converters H 02 M) [4]

H 03

 BASIC ELECTRONIC CIRCUITRY

H 03 B

 GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (measuring, testing G 01 R; generators adapted for electrophonic musical instruments G 10 H; speech synthesis G 10 L; masers, lasers H 01 S; dynamo-electric machines H 02 K; power inverter circuits H 02 M; by using pulse techniques H 03 K; automatic control of generators H 03 L; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified H 03 L; generation of oscillations in plasma H 05 H)

H 03 C

 MODULATION (measuring, testing G 01 R; masers, lasers H 01 S; modulators specially adapted for use in dc amplifiers H 03 F 3/38; modulating pulses H 03 K 7/00; so-called modulators capable only of switching between predetermined states of amplitude, frequency or phase H 03 K 17/00, H 04 L; coding, decoding or code conversion, in general H 03 M; synchronous modulators specially adapted for colour television H 04 N 9/65)

H 03 D

 DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H 01 S; circuits capable of acting both as modulator and demodulator H 03 C; details applicable to both modulators and frequency-changers H 03 C; demodulating pulses H 03 K 9/00; transforming types of pulse modulation H 03 K 11/00; coding, decoding or code conversion, in general H 03 M; repeater stations H 04 B 7/14; demodulators adapted for ac systems of digital-information transmission H 04 L 27/00; synchronous demodulators adapted for colour television H 04 N 9/66)

H 03 F

 AMPLIFIERS (measuring, testing G 01 R; optical parametric amplifiers G 02 F; circuit arrangements with secondary emission tubes H 01 J 43/30; masers, lasers H 01 S; control of amplification H 03 G; coupling arrangements independent of the nature of the amplifier, voltage dividers H 03 H; amplifiers capable only of dealing with pulses H 03 K; repeater circuits in transmission lines H 04 B 3/36, H 04 B 3/58; application of speech amplifiers in telephonic communication H 04 M 1/60, H 04 M 3/40)

H 03 G

 CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H 03 H; control of transmission in lines H 04 B 3/04)

H 03 H

 IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing G 01 R; arrangements for producing a reverberation or echo sound G 10 K 15/08; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H 01 P; control of amplification, e.g. bandwidth control of amplifiers, H 03 G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H 03 J; networks for modifying the frequency characteristics of communication systems H 04 B )

H 03 J

 TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS (indicating arrangements for measuring G 01 D; measuring, testing G 01 R; remote-control in general G 05, G 08; automatic control or stabilisation of generators H 03 L)

H 03 K

 PULSE TECHNIQUE (measuring pulse characteristics G 01 R; mechanical counters having an electrical input G 06 M; information storage devices in general G 11; sample-and-hold arrangements in electric analogue stores G 11 C 27/02; construction of switches involving contact making and breaking for generation of pulses, e.g. by using a moving magnet, H 01 H; static conversion of electric power H 02 M; generation of oscillations by circuits employing active elements which operate in a non-switching manner H 03 B; modulating sinusoidal oscillations with pulses H 03 C, H 04 L; discriminator circuits involving pulse counting H 03 D; automatic control of generators H 03 L; starting, synchronisation, or stabilisation of generators where the type of generator is irrelevant or unspecified H 03 L; coding, decoding or code conversion, in general H 03 M) [4]

H 03 L

 AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators H 02 P) [3]

H 03 M

 CODING; DECODING OR CODE CONVERSION, IN GENERAL (using fluidic means F 15 C 4/00; optical analogue/digital converters G 02 F 7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G 01 D, G 01 R, G 06 F, G 06 T, G 09 G, G 10 L, G 11 B, G 11 C, H 04 L, H 04 M, H 04 N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G 09 C) [4]

H 04

 ELECTRIC COMMUNICATION TECHNIQUE

H 04 B

 TRANSMISSION (transmission systems for measured values, control or similar signals G 08 C; coding, decoding or code conversion, in general H 03 M; broadcast communication H 04 H; multiplex systems H 04 J; secret communication H 04 K; transmission of digital information H 04 L) [4]

H 04 H

 BROADCAST COMMUNICATION (transmission in general H 04 B; multiplex communication H 04 J)

H 04 J

 MULTIPLEX COMMUNICATION (transmission in general H 04 B; peculiar to transmission of digital information H 04 L 5/00; systems for the simultaneous or sequential transmission of more than one television signal H 04 N 7/08; in exchanges H 04 Q 11/00; stereophonic systems H 04 S)

H 04 K

 SECRET COMMUNICATION; JAMMING OF COMMUNICATION

H 04 L

 TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (typewriters B 41 J; order telegraphs, fire or police telegraphs G 08 B; visual telegraphy G 08 B, G 08 C; teleautographic systems G 08 C; ciphering or deciphering apparatus per se G 09 C; coding, decoding or code conversion, in general H 03 M; arrangements common to telegraphic and telephonic communication H 04 M; selecting H 04 Q) [4]

H 04 M

 TELEPHONIC COMMUNICATION (counting mechanisms G 06 M; circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G 08; reels or other take-up devices for cords H 02 G 11/00; multiplex transmission between switching centres H 04 J; selecting arrangements H 04 Q; loudspeakers, microphones, gramophone pick-ups or like electromechanical transducers H 04 R)

H 04 N

 PICTORIAL COMMUNICATION, e.g. TELEVISION (measuring, testing G 01; systems for autographic writing, e.g. writing telegraphy, which involve following an outline G 08; information storage based on relative movement between record carrier and transducer G 11 B; coding, decoding or code conversion, in general H 03 M; broadcast distribution or the recording of use made thereof H 04 H) [4]

H 04 Q

 SELECTING (switches, relays, selectors H 01 H; electronic switches H 03 K 17/00)

H 04 R

 LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS (generating mechanical vibrations in general B 06 B; transducers for measuring particular variables G 01; transducers in clocks G 04; producing sounds with frequency not determined by supply frequency G 10 K; transducers in recording or reproducing heads G 11 B; transducers in motors H 02) [6]

H 04 S

 STEREOPHONIC SYSTEMS (information storage on discs or tapes G 11 B; broadcast systems for the distribution of stereophonic information H 04 H 5/00; multiplex systems in general H 04 J) [3]

H 05

 ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR

H 05 B

 ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR (apparatus for special application, see the relevant places, e.g. A 47 J, B 21 J, B 21 K, C 21, C 22, C 23, F 21, F 24, F 27)

H 05 C

 ELECTRIC CIRCUITS OR APPARATUS SPECIALLY DESIGNED FOR USE IN EQUIPMENT FOR KILLING, STUNNING, ENCLOSING OR GUIDING LIVING BEINGS (stationary means for catching or killing insects by electric means A 01 M 1/22; slaughtering or stunning by electric current A 22 B 3/06)

H 05 F

 STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY (electrostatic machines H 02 N; uses of electricity in performing operations, e.g. precipitation, see the relevant subclasses for the operations)

H 05 G

 X-RAY TECHNIQUE (apparatus for radiation diagnosis A 61 B 6/00; X-ray therapy A 61 N; testing by X-rays G 01 N; apparatus for X-ray photography G 03 B; filters, conversion screens, microscopes G 21 K; X-ray tubes H 01 J 35/00; TV systems having X-ray input H 04 N 5/321)

H 05 H

 PLASMA TECHNIQUE (fusion reactors G 21 B; ion-beam tubes H 01 J 27/00; magnetohydrodynamic generators H 02 K 44/08; producing X-rays involving plasma generation H 05 G 2/00); PRODUCTION OF ACCELERATED ELECTRICALLY- CHARGED PARTICLES OR OF NEUTRONS (obtaining neutrons from radioactive sources G 21, e.g. G 21 B , G 21 C, G 21 G); PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS (atomic clocks G 04 F 5/14; devices using stimulated emission H 01 S; frequency regulation by comparison with a reference frequency determined by energy levels of molecules, atoms, or subatomic particles H 03 L 7/26)

H 05 K

 PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS (details of instruments or comparable details of other apparatus not otherwise provided for G 12 B; thin-film or thick-film circuits H 01 L 27/01, H 01 L 27/13; non-printed means for electric connections to or between printed circuits H 01 R; casings for, or constructional details of, particular types of apparatus, see the relevant subclasses; processes involving only a single technical art, e.g. heating, spraying, for which provision exists elsewhere, see the relevant classes)