|  | H |
SECTION H — ELECTRICITY

|  | H01 |
BASIC ELECTRIC ELEMENTS

|  | H01 |
Note(s) Processes involving only a single technical art, e.g. drying, coating, for which provision exists elsewhere are classified in the relevant class for that art.

|  | H01B |
CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING, OR DIELECTRIC PROPERTIES (selection for magnetic properties Fulltext... Hierarchy... Expanded...H01F 1/00; waveguides Fulltext... Hierarchy... Expanded...H01P; installation of cables or lines Fulltext... Hierarchy... Expanded...H02G)

|  | H01C |
RESISTORS

|  | H01F |
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (selection of magnetostrictive materials Fulltext... Hierarchy... Expanded...H01V 9/02)

|  | H01F |
Note(s) Inductances and transformers are regarded in this sub-class as being "for power supply" if they are intended for this purpose even in systems operating at frequencies above 60 cycles/sec.

|  | H01G |
CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, OR LIGHT-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric Fulltext... Hierarchy... Expanded...H01B 3/00)

|  | H01H |
ELECTRIC SWITCHES; RELAYS; EMERGENCY PROTECTIVE DEVICES (contact cables Fulltext... Hierarchy... Expanded...H01B 7/10; arrester using powdered resistive or semiconductive material Fulltext... Hierarchy... Expanded...H01C 7/12, Fulltext... Hierarchy... Expanded...H01C 15/04; electrolytic arresters Fulltext... Hierarchy... Expanded...H01G 9/00; switching devices of the waveguide type Fulltext... Hierarchy... Expanded...H01P; devices for interrupted current collection Fulltext... Hierarchy... Expanded...H01R 39/00; spark-gap arresters Fulltext... Hierarchy... Expanded...H01T; emergency protective circuit arrangements Fulltext... Hierarchy... Expanded...H02H; switching by electronic means without contact-making Fulltext... Hierarchy... Expanded...H03K 17/00)

|  | H01H |
Note(s) Bases, casings, or covers accommodating two or more switching devices, or a switching device as well as another electric component, e.g. bus-bar, line connector, are classified used in Fulltext... Hierarchy... Expanded...H02B 1/08. For the purpose of this sub-class, the term "relay" is used to denote a switching device having contacts which are operated from electric inputs which supply, directly or indirectly, all the mechanical energy necessary to cause both the closure and the opening of the contacts. Under the heading "emergency protective devices", this sub-class deals with devices for the protection of electric lines or electric machines or apparatus in the event of undesired change from normal electric working conditions, the electrical condition serving directly as the input to the device. In this sub-class: The expression "driving mechanism" refers to the means by which an operating force applied to the switch is transmitted to the moving contact or contacts. The word "operating" is used in a broader sense than "actuating" which is reserved for those parts not touched by hand to effect switching. The words "acting" and "action" denote a self-induced movement of parts at one stage of the switching. These connotations apply to all parts of the verbs "to operate", "to actuate", and "to act", and to words derived therefrom, e.g. to "actuation". Details of an unspecified type of switching device, or stated to be applicable to two or more kinds of switching devices designated by the headings "switches", "relays", "selector switches", and "emergency protective devices", are classified in groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01H 1/00-H01H 9/00. Details of an unspecified type of switch, or stated to be applicable to two or more types of switches as defined by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01H 13/00-H01H 43/00 and sub-groups Fulltext... Hierarchy... Expanded...H01H 35/02, Fulltext... Hierarchy... Expanded...H01H 35/06, Fulltext... Hierarchy... Expanded...H01H 35/14, Fulltext... Hierarchy... Expanded...H01H 35/18, Fulltext... Hierarchy... Expanded...H01H 35/24, and Fulltext... Hierarchy... Expanded...H01H 35/42, all hereinafter termed basic types, are classified in groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01H 1/00-H01H 9/00. Details of an unspecified type of relay, or stated to be applicable to two or more types of relays as defined by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01H 51/00-H01H 61/00, hereinafter called basic types, are classified in Fulltext... Hierarchy... Expanded...H01H 45/00. Details of an unspecified protective device, or applicable to two or more types of protective devices as defined by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01H 73/00-H01H 83/00, hereinafter called basic types, are classified in Fulltext... Hierarchy... Expanded...H01H 71/00. However, a detail only described with reference to or clearly only applicable to switching devices of a single basic type, is classified in the group or sub-group appropriate to switching devices of that basic type, e.g. Fulltext... Hierarchy... Expanded...H01H 19/02, Fulltext... Hierarchy... Expanded...H01H 75/04.

|  | H01J |
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gap arresters Fulltext... Hierarchy... Expanded...H01T; arc lamps with consumable electrodes Fulltext... Hierarchy... Expanded...H05B; particle accelerators Fulltext... Hierarchy... Expanded...H05H)

|  | H01J |
Note(s) This sub-class deals only with devices for producing, influencing, or using a flow of electrons and/or ions, e.g. for controlling, indicating, or switching of electric current, counting electric pulses, producing light or other electromagnetic oscillations, such as X-rays, and having a closed or substantially closed casing containing a chosen gas, vapour, or vacuum, upon the pressure and nature of which the characteristics of the device depend. Light sources using a combination (other than covered by group Fulltext... Hierarchy... Expanded...H01J 61/96 of this sub-class) of discharge and other kinds of light generation are dealt with in Fulltext... Hierarchy... Expanded...H05B 35/00. In this sub-class, the term "lamp" is understood to include tubes emitting ultra-violet or infra-red light. In this sub-class: Details of tubes and lamps: Groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01J 1/00-H01J 7/00 relate only (i) to details of an unspecified kind of discharge tube or lamp, and (ii) to details stated in a specification as applicable to two or more kinds of tubes and/or lamps as defined by groups Fulltext... Hierarchy... Expanded...H01J 11/00, Fulltext... Hierarchy... Expanded...H01J 13/00, Fulltext... Hierarchy... Expanded...H01J 15/00, Fulltext... Hierarchy... Expanded...H01J 17/00, Fulltext... Hierarchy... Expanded...H01J 21/00, Fulltext... Hierarchy... Expanded...H01J 25/00, Fulltext... Hierarchy... Expanded...H01J 27/00, Fulltext... Hierarchy... Expanded...H01J 31/00, Fulltext... Hierarchy... Expanded...H01J 33/00, Fulltext... Hierarchy... Expanded...H01J 35/00, Fulltext... Hierarchy... Expanded...H01J 37/00, Fulltext... Hierarchy... Expanded...H01J 39/00, Fulltext... Hierarchy... Expanded...H01J 41/00, Fulltext... Hierarchy... Expanded...H01J 61/00, Fulltext... Hierarchy... Expanded...H01J 63/00, and Fulltext... Hierarchy... Expanded...H01J 65/00, hereinafter termed basic kinds. A detail only described with reference to, or clearly only applicable to, tubes or lamps of a single basic kind is classified in the detail group appropriate to tubes or lamps of that basic kind, e.g. Fulltext... Hierarchy... Expanded...H01J 17/04. Manufacture: Apparatus or processes specially adapted to the manufacture of electric discharge tubes, discharge lamps, or parts thereof are classified in group Fulltext... Hierarchy... Expanded...H01J 9/00.

|  | H01K |
ELECTRIC INCANDESCENT LAMPS (details or apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps Fulltext... Hierarchy... Expanded...H01J; light sources using a combination of incandescent and other types of light generation Fulltext... Hierarchy... Expanded...H01J 61/96, Fulltext... Hierarchy... Expanded...H05B 35/00)

|  | H01K |
Note(s) In this sub-class, the term "lamp" is intended to include tubes emitting ultra-violet or infra-red light.

|  | H01L |
SEMICONDUCTOR DEVICES (adapted as electroluminescent light sources Fulltext... Hierarchy... Expanded...H05B 33/00; electrolytic devices Fulltext... Hierarchy... Expanded...H01G 9/00; thermo-electric devices Fulltext... Hierarchy... Expanded...H01V 1/00, Fulltext... Hierarchy... Expanded...H01V 3/00)

|  | H01L |
Note(s) Semiconductor devices as interpreted in this sub-class comprise inherently at least one potential-jump barrier which is essential to the desired operation of the device and which separates regions of different conductivity type, at least one region having P, P+, N, N+, I or S type conductivity.

|  | H01M |
BATTERIES; ACCUMULATORS (electrochemical processes or apparatus in general Fulltext... Hierarchy... Expanded...B01K)

|  | H01M |
Note(s) This sub-class deals with galvanic primary or secondary cells or batteries, and fuel cells or batteries.

|  | H01P |
WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (aerials Fulltext... Hierarchy... Expanded...H01Q; networks comprising distributed impedances together with lumped impedance elements Fulltext... Hierarchy... Expanded...H03H)

|  | H01P |
Note(s) In this sub-class, the term "waveguide type" as applied to transmission lines includes only high-frequency coaxial cables or Lecher lines, and as applied to resonators, delay lines, or other devices includes all devices having distributed inductance and capacitance.

|  | H01Q |
AERIALS (microwave radiators for near-field therapeutic treatment Fulltext... Hierarchy... Expanded...A61N 5/06; apparatus for testing aerials or for measuring aerial characteristics Fulltext... Hierarchy... Expanded...G01R; waveguides Fulltext... Hierarchy... Expanded...H01P; heating elements of the wave-guide type Fulltext... Hierarchy... Expanded...H05B 9/06)

|  | H01Q |
Note(s) In addition to the primary active radiating elements, this sub-class includes (a) secondary devices for absorbing or for modifying the direction and/or polarisation of waves radiated from aerials, and (b) combinations with auxiliary devices such as earthing switches, lead-in devices, and lightning protectors. Devices of the waveguide type, such as resonators or lines, not designed as radiating elements are classified in sub-class Fulltext... Hierarchy... Expanded...H01P.

|  | H01R |
LINE CONNECTORS; CURRENT COLLECTORS (switches, fuses Fulltext... Hierarchy... Expanded...H01H; coupling devices of the waveguide type Fulltext... Hierarchy... Expanded...H01P 5/00; switchboards, distribution gear Fulltext... Hierarchy... Expanded...H02B; installations of electric lines, cables, or auxiliary apparatus Fulltext... Hierarchy... Expanded...H02G; connections to printed circuits Fulltext... Hierarchy... Expanded...H05K)

|  | H01R |
Note(s) This sub-class deals with all kinds of contact-making disconnectible and non-disconnectible electric line connectors, coupling devices, lamp or similar holders or current collectors for all kinds of electric lines, cables or apparatus. Mounting of connections in or on specified apparatus is classified in the sub-class for such apparatus, e.g. mounting in junction or distribution boxes is classified in sub-class Fulltext... Hierarchy... Expanded...H02B or Fulltext... Hierarchy... Expanded...H02G, high-temperature connections for heating elements in group Fulltext... Hierarchy... Expanded...H05B 3/08. Structural association of one part of a two-part coupling device with specific electric apparatus is classified with the apparatus, e.g. association of cap with incandescent lamp is classified in sub-class Fulltext... Hierarchy... Expanded...H01K. In this sub-class: A contact in a coupling device is only regarded as an additional earth contact if this contact is clearly designed for that purpose. General details are classified in groups Fulltext... Hierarchy... Expanded...H01R 5/00, Fulltext... Hierarchy... Expanded...H01R 7/00, Fulltext... Hierarchy... Expanded...H01R 9/00 or Fulltext... Hierarchy... Expanded...H01R 11/00.

|  | H01S |
DEVICES USING STIMULATED EMISSION

|  | H01S |
Note(s) This sub-class deals with the generation, amplification, modulation, demodulation or frequency-changing of phase-coherent electromagnetic waves and other forms of wave energy by using stimulated emission

|  | H01T |
SPARK GAPS; OTHER NON-ENCLOSED DISCHARGE APPARATUS (working metal by arc discharge Fulltext... Hierarchy... Expanded...B23, particularly Fulltext... Hierarchy... Expanded...B23P 1/00; arc lamps Fulltext... Hierarchy... Expanded...H05B 31/00)

|  | H01V |
ELECTRIC DEVICES EXHIBITING SPECIFIC PHYSICAL EFFECTS (exhibiting semiconductivity Fulltext... Hierarchy... Expanded...H01L; making crystals Fulltext... Hierarchy... Expanded...B01J 17/00)

|  | H01V |
Note(s) This sub-class deals with devices exhibiting thermo-electric, thermo-magnetic, galvano-magnetic, piezo-electric, electrostrictive, magnetostrictive, or superconductive effects.