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.

 H01F
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (ceramics based on ferrites C04B 35/26; alloys C22C; thermomagnetic devices H01L 37/00)  [2]
 H01F

Note(s)

In this subclass, inductances and transformers are regarded as being "for power supply" if they are intended for this purpose even in systems operating at frequencies above 60 cycles/sec.

 H01F 1/00
Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
 H01F 1/02
·  of hard-magnetic materials
 H01F 1/04
·  ·  metals or alloys
 H01F 1/06
·  ·  ·  in the form of particles, e.g. powder
 H01F 1/08
·  ·  ·  ·  pressed, sintered, or bound together
 H01F 1/09
·  ·  mixtures of metallic and non-metallic particles; metallic particles having oxide skin
 H01F 1/10
·  ·  non-metallic substances, e.g. ferrites
 H01F 1/11
·  ·  ·  in the form of particles
 H01F 1/113
·  ·  ·  ·  in a bonding agent
 H01F 1/117
·  ·  ·  ·  ·  Flexible bodies
 H01F 1/12
·  of soft-magnetic materials
 H01F 1/14
·  ·  metals or alloys
 H01F 1/16
·  ·  ·  in the form of sheets
 H01F 1/18
·  ·  ·  ·  with insulating coating
 H01F 1/20
·  ·  ·  in the form of particles, e.g. powder
 H01F 1/22
·  ·  ·  ·  pressed, sintered, or bound together
 H01F 1/24
·  ·  ·  ·  ·  the particles being insulated
 H01F 1/26
·  ·  ·  ·  ·  ·  by macromolecular organic substances
 H01F 1/28
·  ·  ·  ·  dispersed or suspended in a liquid or plastic medium
 H01F 1/30
·  ·  ·  ·  having specific size or shape (particles of different materials H01F 1/32)
 H01F 1/32
·  ·  ·  ·  the particles being of different materials
 H01F 1/33
·  ·  mixtures of metallic and non-metallic particles; metallic particles having oxide skin
 H01F 1/34
·  ·  non-metallic substances, e.g. ferrites
 H01F 1/36
·  ·  ·  in the form of particles
 H01F 1/37
·  ·  ·  ·  in a bonding agent
 H01F 1/375
·  ·  ·  ·  ·  Flexible bodies
 H01F 3/00
Cores, yokes, or armatures (magnetic materials H01F 1/00; permanent magnets 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 H01F 3/02, on strips or ribbons H01F 3/04, on wires 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 H01F 3/12)
 H01F 5/00
Coils (for transducers H04R)
 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
·  with superconductive windings  [3]
 H01F 7/00
Magnets (for purifying liquids, for separating ores B03C; for bench or like work-holders B23B 31/28, B23Q 3/00; work-holding devices B25B 11/00; lifting magnets B66C 1/00; for electric meters G01R; for relays H01H; for dynamo-electric machines H02K; for electroacoustic devices H04R)
 H01F 7/02
·  Permanent magnets
 H01F 7/04
·  ·  Means for releasing the attractive force
 H01F 7/06
·  Electromagnets
 H01F 7/08
·  ·  with armatures
 H01F 7/10
·  ·  ·  specially adapted for ac
 H01F 7/12
·  ·  ·  ·  having anti-chattering arrangements
 H01F 7/13
·  ·  ·  characterised by pulling-force characteristic
 H01F 7/14
·  ·  ·  Pivoting armatures
 H01F 7/16
·  ·  ·  Rectilinearly-movable armatures
 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
 H01F 7/22
·  ·  ·  having superconductive windings
 H01F 7/24
·  ·  ·  ·  supplying energising or de-energising current; Flux pumps  [3]
 H01F 10/00
Thin magnetic films, e.g. of one-domain structure (magnetic record carriers G11B 5/00; thin-film magnetic stores 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 H01F 41/14)  [3]
 H01F 10/10
·  ·  characterised by the composition  [3]
 H01F 10/12
·  ·  ·  being metals or alloys (intermetallic compounds H01F 10/18)  [3]
 H01F 10/14
·  ·  ·  ·  containing iron or nickel (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 B63G 9/06; for clocks or watches G04D 9/00; demagnetising arrangements for colour television H04N 9/29)
 H01F 15/00
Details of inductances or transformers covered by groups H01F 17/00-H01F 21/00
 H01F 15/02
·  Mounting; Housing; Enclosing; Filling the housing or enclosure
 H01F 15/04
·  Electrostatic or electromagnetic shielding (movable for varying inductance H01F 21/10)
 H01F 15/06
·  Cooling; Heating; Ventilating
 H01F 15/08
·  Protection against corrosion
 H01F 15/10
·  Terminals; Tapping arrangements
 H01F 15/12
·  Arrangements for interchanging inductances, transformers, or coils thereof
 H01F 15/14
·  with special arrangement or spacing of turns of the windings, e.g. to produce desired self-resonance
 H01F 15/16
·  with temperature compensation
 H01F 15/18
·  Circuits for modifying, or compensating for, electric characteristics of inductances or transformers (impedance networks H03H)
 H01F 17/00
Inductances (coils in general H01F 5/00; variable inductances H01F 21/00; for power supply H01F 29/00, H01F 37/00, H01F 39/00)
 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
Transformers or mutual inductances (H01F 36/00 takes precedence; variable H01F 21/00; for power supply H01F 29/00-H01F 35/00, H01F 39/00)  [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 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, e.g. constructions for changing voltage ratio or frequency range (H01F 36/00 takes precedence; for power supply H01F 29/00, H01F 39/00)  [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
Connectors with inductive coupling, i.e. with movable core, coil, or winding for making connections without contact  [3]
 H01F 27/00
Constructional details of transformers or inductances in general
 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 F28F); Ventilating (structural details of casings 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 27/24
·  Magnetic cores
 H01F 27/26
·  ·  Fastening parts of the core together; Fastening or mounting the core on casing or support (on coil H01F 27/30)
 H01F 27/28
·  Coils; Windings; Conductive connections
 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
 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 for modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (of instrument transformers H01F 40/14; impedance networks H03H)
 H01F 29/00
Variable transformers, reactors, or choke coils, for power supply or unspecified use
 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 H03F)
 H01F 31/00
Single-phase transformers for power supply or unspecified use (H01F 36/00 takes precedence)  [3]
 H01F 31/02
·  Auto-transformers
 H01F 31/04
·  having two or more secondary windings, each supplying a separate load, e.g. for power-supply units for radio sets
 H01F 31/06
·  High-leakage transformers, e.g. for arc welding
 H01F 31/08
·  Cascade transformers, e.g. for use with extra high tension
 H01F 33/00
Two-phase, three-phase, or polyphase transformers for power supply or unspecified use (H01F 36/00 takes precedence)  [3]
 H01F 33/02
·  for changing the number of phases
 H01F 35/00
Transformers for operation with non-linear input/output characteristics for power supply or unspecified use, e.g. for generating harmonics, for changing wave shape (H01F 36/00 takes precedence; with variable characteristics H01F 29/14)  [3]
 H01F 36/00
Transformers with superconductive windings or with windings operating at cryogenic temperatures (coils with superconductive windings H01F 5/08; electromagnets without armatures and having a superconductive windings H01F 7/22)  [3]
 H01F 37/00
Reactors or choke coils for power supply or unspecified use (H01F 29/00, H01F 39/00 take precedence)
 H01F 37/02
·  with non-linear characteristics (H01F 29/00, H01F 39/00 take precedence)
 H01F 39/00
Transformers, inductances, reactors, or choke coils without magnetic cores, for power supply or unspecified use (H01F 36/00 takes precedence)  [3]
 H01F 40/00
Instrument transformers (H01F 36/00 takes precedence)  [3]
 H01F 40/02
·  for single-phase ac
 H01F 40/04
·  ·  Voltage transformers
 H01F 40/06
·  ·  Current transformers
 H01F 40/08
·  ·  Combined voltage and current transformers
 H01F 40/10
·  for polyphase ac
 H01F 40/12
·  for dc
 H01F 40/14
·  Circuit arrangements for modifying, or compensating for, electric characteristics
 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 (H01F 41/14 takes precedence; for dynamo-electric machines H02K 15/00)  [3]
 H01F 41/04
·  ·  for manufacturing coils
 H01F 41/06
·  ·  ·  Winding (winding in general B65H, e.g. B65H 81/00)
 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 G11C 5/12)
 H01F 41/10
·  ·  ·  Connecting leads to windings (making electric connections in general H01R 43/00)
 H01F 41/12
·  ·  ·  Insulating of windings (of conductors in general H01B 13/06)
 H01F 41/14
·  for applying thin magnetic films to substrates (covering metals, or materials with metals, in general C23C; manufacturing record carriers G11B 5/84)  [3]
 H01F 41/16
·  ·  the material being applied in the form of particles (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 epitary  [3]