|  | H |
SECTION H — ELECTRICITY

|  | H |
Note(s) These Notes cover the basic principles and general instructions for use of section H. Section H covers: basic electric elements, which cover all electric units and the general mechanical structure of apparatus and circuits, including the assembly of various basic elements into what are called printed circuits and also cover to a certain extent the manufacture of these elements (when not covered elsewhere); generation of electricity, which covers the generation, conversion and distribution of electricity together with the controlling of the corresponding gear; applied electricity, which covers: general utilisation techniques, viz. those of electric heating and electric lighting circuits; some special utilisation techniques, either electric or electronic in the strict sense, which are not covered by other sections of the Classification, including: electric light sources, including lasers; electric X-ray technique; electric plasma technique and the generation and acceleration of electrically charged particles or neutrons; basic electronic circuits and their control; radio or electric communication technique; the use of a specified material for the manufacture of the article or element described. In this connection, paragraphs 57 to 59 of the Guide should be referred to. In this section, the following general rules apply: Subject to the exceptions stated in I(c), above, any electric aspect or part peculiar to a particular operation, process, apparatus, object or article, classified in one of the sections of the Classification other than section H, is always classified in the subclass for that operation, process, apparatus, object or article. Where common characteristics concerning technical subjects of similar nature have been brought out at class level, the electric aspect or part is classified, in conjunction with the operation, process, apparatus, object or article, in a subclass which covers entirely the general electrical applications for the technical subject in question; The electrical applications referred to under (a), above, either general or particular, include: the therapeutic processes and apparatus, in class Fulltext... Hierarchy... Expanded...A61; the electric processes and apparatus used in various laboratory or industrial operations, in classes Fulltext... Hierarchy... Expanded...B01 and Fulltext... Hierarchy... Expanded...B03 and in subclass Fulltext... Hierarchy... Expanded...B23K; the electricity supply, electric propulsion and electric lighting of vehicles in general and of particular vehicles, in the subsection "Transporting" of section B; the electric ignition systems of internal-combustion engines, in subclass Fulltext... Hierarchy... Expanded...F02P, and of combustion apparatus in general, in subclass Fulltext... Hierarchy... Expanded...F23Q; the whole electrical part of section G, i.e. measuring devices including apparatus for measuring electric variables, checking, signalling and calculating. Electricity in that section is generally dealt with as a means and not as an end in itself; All electrical applications, both general and particular, presuppose that the "basic electricity" aspect appears in section H (see I(a), above) as regards the electric "basic elements" which they comprise. This rule is also valid for applied electricity, referred to in I(c), above, which appears in section H itself. In this section, the following special cases occur: Among the general applications covered by sections other than section H, it is worth noting that electric heating in general is covered by subclasses Fulltext... Hierarchy... Expanded...F24D or Fulltext... Hierarchy... Expanded...F24H or class Fulltext... Hierarchy... Expanded...F27, and that electric lighting in general is partly covered by class Fulltext... Hierarchy... Expanded...F21, since in section H (see I(c), above) there are places in Fulltext... Hierarchy... Expanded...H05B which cover the same technical subjects; In the two cases referred to under (a), above, the subclasses of section F, which deal with the respective subjects, essentially cover in the first place the whole mechanical aspect of the apparatus or devices, whereas the electrical aspect, as such, is covered by subclass Fulltext... Hierarchy... Expanded...H05B; In the case of lighting, this mechanical aspect should be taken to cover the material arrangement of the various electric elements, i.e., their geometrical or physical position in relation to one another; this aspect is covered by subclass Fulltext... Hierarchy... Expanded...F21V, the elements themselves and the primary circuits remaining in section H. The same applies to electric light sources, when combined with light sources of a different kind. These are covered by subclass Fulltext... Hierarchy... Expanded...H05B, whereas the physical arrangement which their combination constitutes is covered by the various subclasses of class Fulltext... Hierarchy... Expanded...F21; As regards heating, not only the electric elements and circuitry designs, as such, are covered by subclass Fulltext... Hierarchy... Expanded...H05B, but also the electric aspects of their arrangement, where these concern cases of general application; electric furnaces being considered as such. The physical disposition of the electric elements in furnaces is covered by section F. If a comparison is made with electric welding circuits, which are covered by subclass Fulltext... Hierarchy... Expanded...B23K in connection with welding, it can be seen that electric heating is not covered by the general rule stated in II, above.

|  | 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.

|  | H01F |
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (ceramics based on ferrites Fulltext... Hierarchy... Expanded...C04B 35/26; alloys Fulltext... Hierarchy... Expanded...C22C; thermomagnetic devices Fulltext... Hierarchy... Expanded...H01L 37/00; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers Fulltext... Hierarchy... Expanded...H04R) [2]

|  | H01F |
Note(s) Groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01F 17/00-H01F 38/00 (with the exception of groups Fulltext... Hierarchy... Expanded...H01F 27/42 and Fulltext... Hierarchy... Expanded...H01F 38/32) cover only structural or constructional aspects of transformers, inductive reactors, chokes or the like. These groups do not cover circuit arrangement of such devices, which are covered by the appropriate functional places. [6]

|  | H01F |
Subclass index
MAGNETS, ELECTROMAGNETS |
Characterised by the magnetic material | 1/00
Cores, yokes, armatures | 3/00
Coils | 5/00
Superconducting coils or magnets | 6/00
Magnets | 7/00
Magnetising, demagnetising | 13/00
Manufacture | 41/00
THIN FILMS | 10/00
FIXED INDUCTANCES OR TRANSFORMERS |
Of the signal type | 17/00, 19/00
Other than of the signal type | 30/00, 37/00
Manufacture | 41/00
VARIABLE INDUCTANCES OR TRANSFORMERS |
Of the signal type | 21/00
Other than of the signal type | 29/00
Manufacture | 41/00
DETAILS OF TRANSFORMERS OR INDUCTANCES, IN GENERAL | 27/00
SUPERCONDUCTIVE OR CRYOGENIC TRANSFORMERS | 36/00
ADAPTATIONS OF TRANSFORMERS OR INDUCTANCES FOR SPECIFIC APPLICATIONS OR FUNCTIONS | 38/00

|  | H01F 1/00 |
Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

|  | H01F 1/01 |
· | of inorganic materials (Fulltext... Hierarchy... Expanded...H01F 1/44 takes precedence) [6]

|  | H01F 1/02 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 1/032 )

|  | H01F 1/03 - H01F 1/03 |
Note(s) Group Fulltext... Hierarchy... Expanded...H01F 1/40 takes precedence over Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H01F 1/03-H01F 1/38. [6]

|  | H01F 1/03 |
· · | characterised by their coercivity [6]

|  | H01F 1/032 |
· · · | of hard-magnetic materials [6]

|  | H01F 1/04 |
· · · · | metals or alloys [6]

|  | H01F 1/047 |
· · · · · | Alloys characterised by their composition [5,6]

|  | H01F 1/053 |
· · · · · · | containing rare earth metals [5,6]

|  | H01F 1/055 |
· · · · · · · | and magnetic transition metals, e.g. SmCo5 [6]

|  | H01F 1/057 |
· · · · · · · · | and IIIa elements, e.g. Nd2Fe14B [6]

|  | H01F 1/058 |
· · · · · · · · | and IVa elements, e.g. Gd2Fe14C [6]

|  | H01F 1/059 |
· · · · · · · · | and Va elements, e.g. Sm2Fe17N2 [6]

|  | H01F 1/06 |
· · · · · | in the form of particles, e.g. powder (Fulltext... Hierarchy... Expanded...H01F 1/047 takes precedence) [5,6]

|  | H01F 1/08 |
· · · · · · | pressed, sintered, or bound together [6]

|  | H01F 1/09 |
· · · · | mixtures of metallic and non-metallic particles; metallic particles having oxide skin [6]

|  | H01F 1/10 |
· · · · | non-metallic substances, e.g. ferrites [6]

|  | H01F 1/11 |
· · · · · | in the form of particles [6]

|  | H01F 1/113 |
· · · · · · | in a bonding agent [6]

|  | H01F 1/117 |
· · · · · · · | Flexible bodies [6]

|  | H01F 1/12 |
· · · | of soft-magnetic materials [6]

|  | H01F 1/14 |
· · · · | metals or alloys [6]

|  | H01F 1/147 |
· · · · · | Alloys characterised by their composition [5,6]

|  | H01F 1/153 |
· · · · · · | Amorphous metallic alloys, e.g. glassy metals [5,6]

|  | H01F 1/16 |
· · · · · | in the form of sheets (Fulltext... Hierarchy... Expanded...H01F 1/147 takes precedence) [5,6]

|  | H01F 1/18 |
· · · · · · | with insulating coating [6]

|  | H01F 1/20 |
· · · · · | in the form of particles, e.g. powder (Fulltext... Hierarchy... Expanded...H01F 1/147 takes precedence) [5,6]

|  | H01F 1/22 |
· · · · · · | pressed, sintered, or bound together [6]

|  | H01F 1/24 |
· · · · · · · | the particles being insulated [6]

|  | H01F 1/26 |
· · · · · · · · | by macromolecular organic substances [6]

|  | H01F 1/28 |
· · · · · · | dispersed or suspended in a bonding agent [6]

|  | H01F 1/30 |
( covered by Fulltext... Hierarchy... Expanded...H01F 1/00 )

|  | H01F 1/32 |
( covered by Fulltext... Hierarchy... Expanded...H01F 1/20, Fulltext... Hierarchy... Expanded...H01F 1/33, Fulltext... Hierarchy... Expanded...H01F 1/36 )

|  | H01F 1/33 |
· · · · | mixtures of metallic and non-metallic particles; metallic particles having oxide skin [6]

|  | H01F 1/34 |
· · · · | non-metallic substances, e.g. ferrites [6]

|  | H01F 1/36 |
· · · · · | in the form of particles [6]

|  | H01F 1/37 |
· · · · · · | in a bonding agent [6]

|  | H01F 1/375 |
· · · · · · · | Flexible bodies [6]

|  | H01F 1/38 |
· · · · · | amorphous, e.g. amorphous oxides [6]

|  | H01F 1/40 |
· · | of magnetic semiconductor materials, e.g. CdCr2S4 (devices using galvano-magnetic or similar effects Fulltext... Hierarchy... Expanded...H01L 43/00) [6]

|  | H01F 1/42 |
· | of organic or organo-metallic materials (Fulltext... Hierarchy... Expanded...H01F 1/44 takes precedence) [6]

|  | H01F 1/44 |
· | of magnetic liquids, e.g. ferrofluids (particles in a bonding agent Fulltext... Hierarchy... Expanded...H01F 1/28, Fulltext... Hierarchy... Expanded...H01F 1/36) [6]

|  | H01F 3/00 |
Cores, yokes, or armatures (magnetic materials Fulltext... Hierarchy... Expanded...H01F 1/00; permanent magnets Fulltext... Hierarchy... Expanded...H01F 7/02)

|  | H01F 3/02 |
· | made from sheets

|  | H01F 3/04 |
· | made from strips or ribbons

|  | H01F 3/06 |
· | made from wires

|  | H01F 3/08 |
· | made from powder (powder coatings on sheets Fulltext... Hierarchy... Expanded...H01F 3/02, on strips or ribbons Fulltext... Hierarchy... Expanded...H01F 3/04, on wires Fulltext... Hierarchy... Expanded...H01F 3/06)

|  | H01F 3/10 |
· | Composite arrangements of magnetic circuits

|  | H01F 3/12 |
· · | Magnetic shunt paths

|  | H01F 3/14 |
· · | Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths Fulltext... Hierarchy... Expanded...H01F 3/12)

|  | H01F 5/00 |
Coils (superconducting coils Fulltext... Hierarchy... Expanded...H01F 6/06; fixed inductances of the signal type Fulltext... Hierarchy... Expanded...H01F 17/00)

|  | H01F 5/02 |
· | wound on non-magnetic supports, e.g. formers

|  | H01F 5/04 |
· | Arrangements of electric connections to coils, e.g. leads

|  | H01F 5/06 |
· | Insulation of windings

|  | H01F 5/08 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 6/06 )

|  | H01F 6/00 |
Superconducting magnets; Superconducting coils [6]

|  | H01F 6/02 |
· | Quenching; Protection arrangements during quenching [6]

|  | H01F 6/04 |
· | Cooling [6]

|  | H01F 6/06 |
· | Coils, e.g. winding, insulating, terminating or casing arrangements therefor [6]

|  | H01F 7/00 |
Magnets (superconducting magnets Fulltext... Hierarchy... Expanded...H01F 6/00; for separation of solid materials from solid materials or fluids Fulltext... Hierarchy... Expanded...B03C 1/00; for bench or like work-holders Fulltext... Hierarchy... Expanded...B23B 31/28, Fulltext... Hierarchy... Expanded...B23Q 3/00; work-holding devices Fulltext... Hierarchy... Expanded...B25B 11/00; lifting magnets Fulltext... Hierarchy... Expanded...B66C 1/00; for electric meters Fulltext... Hierarchy... Expanded...G01R; for relays Fulltext... Hierarchy... Expanded...H01H; for dynamo-electric machines Fulltext... Hierarchy... Expanded...H02K)

|  | H01F 7/02 |
· | Permanent magnets

|  | H01F 7/04 |
· · | Means for releasing the attractive force

|  | H01F 7/06 |
· | Electromagnets; Actuators including electromagnets [6]

|  | H01F 7/08 |
· · | with armatures

|  | H01F 7/10 |
· · · | specially adapted for ac

|  | H01F 7/11 |
· · · · | reducing or eliminating the effects of eddy currents [6]

|  | H01F 7/12 |
· · · · | having anti-chattering arrangements

|  | H01F 7/121 |
· · · | Guiding or setting position of armatures, e.g. retaining armatures in their end position [6]

|  | H01F 7/122 |
· · · · | by permanent magnet [6]

|  | H01F 7/123 |
· · · · | by ancillary coil [6]

|  | H01F 7/124 |
· · · · | by mechanical latch, e.g. detent [6]

|  | H01F 7/126 |
· · · | Supporting or mounting [6]

|  | H01F 7/127 |
· · · | Assembling [6]

|  | H01F 7/128 |
· · · | Encapsulating, encasing or sealing [6]

|  | H01F 7/129 |
· · · · | of armatures [6]

|  | H01F 7/13 |
· · · | characterised by pulling-force characteristic

|  | H01F 7/14 |
· · · | Pivoting armatures (Fulltext... Hierarchy... Expanded...H01F 7/17 takes precedence) [6]

|  | H01F 7/16 |
· · · | Rectilinearly-movable armatures (Fulltext... Hierarchy... Expanded...H01F 7/17 takes precedence) [6]

|  | H01F 7/17 |
· · · | Pivoting and rectilinearly-movable armatures [6]

|  | H01F 7/18 |
· · · | Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings

|  | H01F 7/20 |
· · | without armatures (cores Fulltext... Hierarchy... Expanded...H01F 3/00; coils Fulltext... Hierarchy... Expanded...H01F 5/00)

|  | H01F 7/22 - H01F 7/24 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 6/00 )

|  | H01F 10/00 |
Thin magnetic films, e.g. of one-domain structure (magnetic record carriers Fulltext... Hierarchy... Expanded...G11B 5/00; thin-film magnetic stores Fulltext... Hierarchy... Expanded...G11C)

|  | H01F 10/06 |
· | characterised by the coupling or physical contact with connecting or interacting conductors

|  | H01F 10/08 |
· | characterised by magnetic layers (applying thin magnetic films to substrates Fulltext... Hierarchy... Expanded...H01F 41/14) [3]

|  | H01F 10/10 |
· · | characterised by the composition [3]

|  | H01F 10/12 |
· · · | being metals or alloys (intermetallic compounds Fulltext... Hierarchy... Expanded...H01F 10/18) [3]

|  | H01F 10/14 |
· · · · | containing iron or nickel (Fulltext... Hierarchy... Expanded...H01F 10/16 takes precedence) [3]

|  | H01F 10/16 |
· · · · | containing cobalt [3]

|  | H01F 10/18 |
· · · | being compounds [3]

|  | H01F 10/20 |
· · · · | Ferrites [3]

|  | H01F 10/22 |
· · · · · | Orthoferrites [3]

|  | H01F 10/24 |
· · · · · | Garnets [3]

|  | H01F 10/26 |
· | characterised by the substrate or intermediate layers [3]

|  | H01F 10/28 |
· · | characterised by the composition of the substrate [3]

|  | H01F 10/30 |
· · | characterised by the composition of intermediate layers [3]

|  | H01F 13/00 |
Apparatus or processes for magnetising or demagnetising (for degaussing ships Fulltext... Hierarchy... Expanded...B63G 9/06; for clocks or watches Fulltext... Hierarchy... Expanded...G04D 9/00; demagnetising arrangements for colour television Fulltext... Hierarchy... Expanded...H04N 9/29)

|  | H01F 15/00 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/00 )

|  | H01F 15/02 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/00, Fulltext... Hierarchy... Expanded...H01F 27/02, Fulltext... Hierarchy... Expanded...H01F 27/06, covered by Fulltext... Hierarchy... Expanded...H01F 27/00 )

|  | H01F 15/04 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/36 )

|  | H01F 15/06 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/00, Fulltext... Hierarchy... Expanded...H01F 27/08, covered by Fulltext... Hierarchy... Expanded...H01F 27/00 )

|  | H01F 15/08 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/23 )

|  | H01F 15/10 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 21/12, Fulltext... Hierarchy... Expanded...H01F 27/29, Fulltext... Hierarchy... Expanded...H01F 29/02, Fulltext... Hierarchy... Expanded...H01R 9/00 )

|  | H01F 15/12 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/00 )

|  | H01F 15/14 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 21/00, Fulltext... Hierarchy... Expanded...H01F 30/08 )

|  | H01F 15/16 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/00 )

|  | H01F 15/18 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/42 )

|  | H01F 17/00 |
Fixed inductances of the signal type (coils in general Fulltext... Hierarchy... Expanded...H01F 5/00)

|  | H01F 17/02 |
· | without magnetic core

|  | H01F 17/03 |
· · | with ceramic former

|  | H01F 17/04 |
· | with magnetic core

|  | H01F 17/06 |
· · | with core substantially closed in itself, e.g. toroid

|  | H01F 17/08 |
· · · | Loading coils for telecommunication circuits

|  | H01F 19/00 |
Fixed transformers or mutual inductances of the signal type (Fulltext... Hierarchy... Expanded...H01F 36/00 takes precedence) [3]

|  | H01F 19/02 |
· | Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably beyond the audio range

|  | H01F 19/04 |
· | Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range (resonant circuits Fulltext... Hierarchy... Expanded...H03H)

|  | H01F 19/06 |
· · | Broad-band transformers, e.g. suitable for handling frequencies well down into the audio range

|  | H01F 19/08 |
· · | Transformers having magnetic bias, e.g. for handling pulses

|  | H01F 21/00 |
Variable inductances or transformers of the signal type (Fulltext... Hierarchy... Expanded...H01F 36/00 takes precedence) [3]

|  | H01F 21/02 |
· | continuously variable, e.g. variometers

|  | H01F 21/04 |
· · | by relative movement of turns or parts of windings

|  | H01F 21/06 |
· · | by movement of core or part of core relative to the windings as a whole

|  | H01F 21/08 |
· · | by varying the permeability of the core, e.g. by varying magnetic bias

|  | H01F 21/10 |
· · | by means of a movable shield

|  | H01F 21/12 |
· | discontinuously variable, e.g. tapped

|  | H01F 23/00 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/14 )

|  | H01F 27/00 |
Details of transformers or inductances, in general [6]

|  | H01F 27/02 |
· | Casings

|  | H01F 27/04 |
· · | Leading of conductors or axles through casings, e.g. for tap-changing arrangements

|  | H01F 27/06 |
· | Mounting, supporting, or suspending transformers, reactors, or choke coils

|  | H01F 27/08 |
· | Cooling (heat-transfer elements Fulltext... Hierarchy... Expanded...F28F); Ventilating (structural details of casings Fulltext... Hierarchy... Expanded...H01F 27/02)

|  | H01F 27/10 |
· · | Liquid cooling

|  | H01F 27/12 |
· · · | Oil cooling

|  | H01F 27/14 |
· · · · | Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

|  | H01F 27/16 |
· · · | Water cooling

|  | H01F 27/18 |
· · · | by evaporating liquids

|  | H01F 27/20 |
· · | Cooling by special gases or non-ambient air

|  | H01F 27/22 |
· · | Cooling by heat conduction through solid or powdered fillings

|  | H01F 27/23 |
· | Corrosion protection [6]

|  | H01F 27/24 |
· | Magnetic cores

|  | H01F 27/245 |
· · | made from sheets, e.g. grain-oriented (Fulltext... Hierarchy... Expanded...H01F 27/26 takes precedence) [5]

|  | H01F 27/25 |
· · | made from strips or ribbons (Fulltext... Hierarchy... Expanded...H01F 27/26 takes precedence) [5]

|  | H01F 27/255 |
· · | made from particles (Fulltext... Hierarchy... Expanded...H01F 27/26 takes precedence) [5]

|  | H01F 27/26 |
· · | Fastening parts of the core together; Fastening or mounting the core on casing or support (on coil Fulltext... Hierarchy... Expanded...H01F 27/30)

|  | H01F 27/28 |
· | Coils; Windings; Conductive connections

|  | H01F 27/29 |
· · | Terminals; Tapping arrangements [6]

|  | H01F 27/30 |
· · | Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support

|  | H01F 27/32 |
· · | Insulating of coils, windings, or parts thereof

|  | H01F 27/33 |
· | Arrangements for noise damping

|  | H01F 27/34 |
· | Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields

|  | H01F 27/36 |
· · | Electric or magnetic shields or screens (movable for varying inductance Fulltext... Hierarchy... Expanded...H01F 21/10) [6]

|  | H01F 27/38 |
· · | Auxiliary core members; Auxiliary coils or windings

|  | H01F 27/40 |
· | Structural association with built-in electric component, e.g. fuse

|  | H01F 27/42 |
· | Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output Fulltext... Hierarchy... Expanded...H02P 13/00; impedance networks Fulltext... Hierarchy... Expanded...H03H) [6]

|  | H01F 29/00 |
Variable transformers or inductances not covered by group Fulltext... Hierarchy... Expanded...H01F 21/00

|  | H01F 29/02 |
· | with tappings on coil or winding; with provision for rearrangement or interconnection of windings

|  | H01F 29/04 |
· · | having provision for tap-changing without interrupting the load current

|  | H01F 29/06 |
· | with current collector gliding or rolling on or along winding

|  | H01F 29/08 |
· | with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators

|  | H01F 29/10 |
· · | having movable part of magnetic circuit

|  | H01F 29/12 |
· · | having movable coil, winding, or part thereof; having movable shield

|  | H01F 29/14 |
· | with variable magnetic bias (magnetic amplifiers Fulltext... Hierarchy... Expanded...H03F)

|  | H01F 30/00 |
Fixed transformers not covered by group Fulltext... Hierarchy... Expanded...H01F 19/00 [6]

|  | H01F 30/02 |
· | Auto-transformers [6]

|  | H01F 30/04 |
· | having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies [6]

|  | H01F 30/06 |
· | characterised by the structure [6]

|  | H01F 30/08 |
· · | without magnetic core [6]

|  | H01F 30/10 |
· · | Single-phase transformers (Fulltext... Hierarchy... Expanded...H01F 30/16 takes precedence) [6]

|  | H01F 30/12 |
· · | Two-phase, three-phase or polyphase transformers [6]

|  | H01F 30/14 |
· · · | for changing the number of phases [6]

|  | H01F 30/16 |
· · | Toroidal transformers [6]

|  | H01F 31/00 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 30/00, Fulltext... Hierarchy... Expanded...H01F 38/00 )

|  | H01F 31/02 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 30/02 )

|  | H01F 31/04 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 30/04 )

|  | H01F 31/06 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/08 )

|  | H01F 31/08 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/16 )

|  | H01F 33/00 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 30/12 )

|  | H01F 33/02 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 30/14 )

|  | H01F 35/00 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/02 )

|  | H01F 36/00 |
Transformers with superconductive windings or with windings operating at cryogenic temperatures (superconducting magnets or superconducting coils Fulltext... Hierarchy... Expanded...H01F 6/00) [3]

|  | H01F 37/00 |
Fixed inductances not covered by group Fulltext... Hierarchy... Expanded...H01F 17/00 [6]

|  | H01F 37/02 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/02 )

|  | H01F 38/00 |
Adaptations of transformers or inductances for specific applications or functions [6]

|  | H01F 38/02 |
· | for non-linear operation [6]

|  | H01F 38/04 |
· · | for frequency changing [6]

|  | H01F 38/06 |
· · | for changing the wave shape [6]

|  | H01F 38/08 |
· | High-leakage transformers or inductances [6]

|  | H01F 38/10 |
· · | Ballasts, e.g. for discharge lamps [6]

|  | H01F 38/12 |
· | Ignition, e.g. for IC engines [6]

|  | H01F 38/14 |
· | Inductive couplings [6]

|  | H01F 38/16 |
· | Cascade transformers, e.g. for use with extra high tension [6]

|  | H01F 38/18 |
· | Rotary transformers [6]

|  | H01F 38/20 |
· | Instrument transformers [6]

|  | H01F 38/22 |
· · | for single phase ac [6]

|  | H01F 38/24 |
· · · | Voltage transformers [6]

|  | H01F 38/26 |
· · · · | Constructions [6]

|  | H01F 38/28 |
· · · | Current transformers [6]

|  | H01F 38/30 |
· · · · | Constructions [6]

|  | H01F 38/32 |
· · · · | Circuit arrangements [6]

|  | H01F 38/34 |
· · · | Combined voltage and current transformers [6]

|  | H01F 38/36 |
· · · · | Constructions [6]

|  | H01F 38/38 |
· · | for polyphase ac [6]

|  | H01F 38/40 |
· · | for dc [6]

|  | H01F 38/42 |
· | Flyback transformers [6]

|  | H01F 39/00 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 30/08 )

|  | H01F 40/00 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/20 )

|  | H01F 40/02 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/22 )

|  | H01F 40/04 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/24 )

|  | H01F 40/06 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/28 )

|  | H01F 40/08 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/34 )

|  | H01F 40/10 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/38 )

|  | H01F 40/12 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 38/40 )

|  | H01F 40/14 |
( transferred to Fulltext... Hierarchy... Expanded...H01F 27/42 )

|  | H01F 41/00 |
Apparatus or processes specially adapted for manufacturing or assembling the devices covered by this subclass

|  | H01F 41/02 |
· | for manufacturing cores, coils, or magnets (Fulltext... Hierarchy... Expanded...H01F 41/14 takes precedence; for dynamo-electric machines Fulltext... Hierarchy... Expanded...H02K 15/00) [3]

|  | H01F 41/04 |
· · | for manufacturing coils

|  | H01F 41/06 |
· · · | Winding

|  | H01F 41/08 |
· · · · | Winding conductors on to or threading conductors through cores or formers which are closed in themselves, e.g. toroids (for interconnecting digital storage elements Fulltext... Hierarchy... Expanded...G11C 5/12)

|  | H01F 41/10 |
· · · | Connecting leads to windings (making electric connections in general Fulltext... Hierarchy... Expanded...H01R 43/00)

|  | H01F 41/12 |
· · · | Insulating of windings (of conductors in general Fulltext... Hierarchy... Expanded...H01B 13/06)

|  | H01F 41/14 |
· | for applying thin magnetic films to substrates (covering metals, or materials with metals, in general Fulltext... Hierarchy... Expanded...C23C; manufacturing record carriers Fulltext... Hierarchy... Expanded...G11B 5/84) [3]

|  | H01F 41/16 |
· · | the material being applied in the form of particles (Fulltext... Hierarchy... Expanded...H01F 41/18 takes precedence) [3]

|  | H01F 41/18 |
· · | by cathode sputtering [3]

|  | H01F 41/20 |
· · | by evaporation [3]

|  | H01F 41/22 |
· · | Heat treatment; Thermal decomposition; Chemical vapour deposition [3]

|  | H01F 41/24 |
· · | from liquids [3]

|  | H01F 41/26 |
· · · | using electric currents [3]

|  | H01F 41/28 |
· · · | by liquid phase epitaxy [3]