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 (selection of magnetostrictive materials 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.

 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 sheet(s)
 H01F 3/04
·  made from strip(s) or ribbon(s)
 H01F 3/06
·  made from wire(s)
 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 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 alternating current
 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 armature
 H01F 7/22
·  ·  ·  having a superconductive winding
 H01F 10/00
Thin magnetic films, e.g. of one-domain structure (magnetic record carriers G11B 5/00; thin-film magnetic stores G11C)
 H01F 10/02
·  characterised by the compositon of the magnetic layer
 H01F 10/04
·  characterised by the substrate, e.g. glass
 H01F 10/06
·  characterised by the coupling or physical contact with connecting or interacting conductors
 H01F 13/00
Apparatus or processes for magnetising or demagnetising (for degaussing ships B63G 9/06; for clocks or watches G04D 9/00)
 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 winding(s), 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 (variable H01F 21/00; for power supply H01F 29/00-H01F 35/00, H01F 39/00)
 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 (for power supply H01F 29/00, H01F 39/00)
 H01F 21/02
·  continuously variable, e.g. variometers
 H01F 21/04
·  ·  by relative movement of turns or parts of winding(s)
 H01F 21/06
·  ·  by movement of core or part of core relative to the winding(s) 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 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 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 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 (with variable characteristics H01F 29/14)
 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 40/00
Instrument transformers
 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 transformers, inductances, reactors or choke coils
 H01F 41/02
·  for manufacturing cores, coils, or magnets (for dynamo-electric machines H02K 15/00)
 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
 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)