IPC 7 English version H01F 10/00-H01F 41/34

IPC ⁷ English version

H01F - H01F 7/20

H01F01000-H01F04134

SECTION H – ELECTRICITY

H 01

BASIC ELECTRIC ELEMENTS

H 01 F

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

10/

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

10/

characterised by the coupling or physical contact with connecting or interacting conductors

10/

characterised by magnetic layers (applying magnetic films to substrates H01F 41/14) [3]

10/

characterised by the composition [3]

10/

being metals or alloys (intermetallic compounds H01F 10/18) [3]

10/

Amorphous metallic alloys, e.g. glassy metals [7]

10/

containing iron or nickel (H01F 10/13, H01F 10/16 take precedence) [3,7]

10/

containing cobalt (H01F 10/13 takes precedence) [3,7]

10/

being compounds [3]

10/

187

Amorphous compounds [7]

10/

193

Magnetic semiconductor compounds [7]

10/

Ferrites [3]

10/

Orthoferrites [3]

10/

Garnets [3]

10/

characterised by the substrate or intermediate layers (H01F 10/32 takes precedence) [3,7]

10/

characterised by the composition of the substrate [3]

10/

characterised by the composition of intermediate layers [3]

10/

Spin-exchange-coupled multilayers, e.g. nanostructured superlattices [7]

13/

Apparatus or processes for magnetising or demagnetising (for degaussing ships B63G 9/06; for clocks or watches G04D 9/00; demagnetising arrangements for colour television H04N 9/29)

17/

Fixed inductances of the signal type (coils in general H01F 5/00)

17/

without magnetic core

17/

with ceramic former

17/

with magnetic core

17/

with core substantially closed in itself, e.g. toroid

17/

Loading coils for telecommunication circuits

19/

Fixed transformers or mutual inductances of the signal type (H01F 36/00 takes precedence) [3]

19/

Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably beyond the audio range

19/

Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range (resonant circuits H03H)

19/

Broad-band transformers, e.g. suitable for handling frequencies well down into the audio range

19/

Transformers having magnetic bias, e.g. for handling pulses

21/

Variable inductances or transformers of the signal type (H01F 36/00 takes precedence) [3]

21/

continuously variable, e.g. variometers

21/

by relative movement of turns or parts of windings

21/

by movement of core or part of core relative to the windings as a whole

21/

by varying the permeability of the core, e.g. by varying magnetic bias

21/

by means of a movable shield

21/

discontinuously variable, e.g. tapped

27/

Details of transformers or inductances, in general [6]

27/

Casings

27/

Leading of conductors or axles through casings, e.g. for tap-changing arrangements

27/

Mounting, supporting, or suspending transformers, reactors, or choke coils

27/

Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F 27/02)

27/

Liquid cooling

27/

Oil cooling

27/

Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

27/

Water cooling

27/

by evaporating liquids

27/

Cooling by special gases or non-ambient air

27/

Cooling by heat conduction through solid or powdered fillings

27/

Corrosion protection [6]

27/

Magnetic cores

27/

245

made from sheets, e.g. grain-oriented (H01F 27/26 takes precedence) [5]

27/

made from strips or ribbons (H01F 27/26 takes precedence) [5]

27/

255

made from particles (H01F 27/26 takes precedence) [5]

27/

Fastening parts of the core together; Fastening or mounting the core on casing or support (on coil H01F 27/30)

27/

Coils; Windings; Conductive connections

27/

Terminals; Tapping arrangements [6]

27/

Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support

27/

Insulating of coils, windings, or parts thereof

27/

Arrangements for noise damping

27/

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

27/

Electric or magnetic shields or screens (movable for varying inductance H01F 21/10) [6]

27/

Auxiliary core members; Auxiliary coils or windings

27/

Structural association with built-in electric component, e.g. fuse

27/

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 H02P 13/00; impedance networks H03H) [6]

29/

Variable transformers or inductances not covered by group H01F 21/00

29/

with tappings on coil or winding; with provision for rearrangement or interconnection of windings

29/

having provision for tap-changing without interrupting the load current

29/

with current collector gliding or rolling on or along winding

29/

with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators

29/

having movable part of magnetic circuit

29/

having movable coil, winding, or part thereof; having movable shield

29/

with variable magnetic bias (magnetic amplifiers H03F)

30/

Fixed transformers not covered by group H01F 19/00 [6]

30/

Auto-transformers [6]

30/

having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies [6]

30/

characterised by the structure [6]

30/

without magnetic core [6]

30/

Single-phase transformers (H01F 30/16 takes precedence) [6]

30/

Two-phase, three-phase or polyphase transformers [6]

30/

for changing the number of phases [6]

30/

Toroidal transformers [6]

36/

Transformers with superconductive windings or with windings operating at cryogenic temperatures (superconducting magnets or superconducting coils H01F 6/00) [3]

37/

Fixed inductances not covered by group H01F 17/00 [6]

38/

Adaptations of transformers or inductances for specific applications or functions [6]

38/

for non-linear operation [6]

38/

for frequency changing [6]

38/

for changing the wave shape [6]

38/

High-leakage transformers or inductances [6]

38/

Ballasts, e.g. for discharge lamps [6]

38/

Ignition, e.g. for IC engines [6]

38/

Inductive couplings [6]

38/

Cascade transformers, e.g. for use with extra high tension [6]

38/

Rotary transformers [6]

38/

Instrument transformers [6]

38/

for single phase ac [6]

38/

Voltage transformers [6]

38/

Constructions [6]

38/

Current transformers [6]

38/

Constructions [6]

38/

Circuit arrangements [6]

38/

Combined voltage and current transformers [6]

38/

Constructions [6]

38/

for polyphase ac [6]

38/

for dc [6]

38/

Flyback transformers [6]

41/

Apparatus or processes specially adapted for manufacturing or assembling the devices covered by this subclass

41/

for manufacturing cores, coils, or magnets (H01F 41/14 takes precedence; for dynamo-electric machines H02K 15/00) [3]

41/

for manufacturing coils

41/

Winding

41/

Winding conductors on to or threading conductors through cores or formers which are closed in themselves, e.g. toroids (for interconnecting digital storage elements G11C 5/12)

41/

Connecting leads to windings (making electric connections in general H01R 43/00)

41/

Insulating of windings (of conductors in general H01B 13/06)

41/

for applying magnetic films to substrates (covering metals, or materials with metals, in general C23C; manufacturing record carriers G11B 5/84) [3]

Note

Group H01F 41/30 takes precedence over groups H01F 41/16 to H01F 41/24. [7]

41/

the magnetic material being applied in the form of particles, e.g. by serigraphy (H01F 41/18 takes precedence) [3,7]

41/

by cathode sputtering [3]

41/

by evaporation [3]

41/

Heat treatment; Thermal decomposition; Chemical vapour deposition [3]

41/

from liquids [3]

41/

using electric currents [3]

41/

by liquid phase epitaxy [3]

41/

for applying nanostructures, e.g. by molecular beam epitaxy (MBE) [7]

41/

for applying conductive, insulating or magnetic material on a magnetic film [7]

41/

in patterns, e.g. by lithography [7]

H01F - H01F 7/20