IPC Definitions - January 01, 2012

H01F - Definition fr

Definition statement

This subclass covers:

Fixed and variable transformers including, for example, superconductive or cryogenic transformers; adaptations thereof for specific applications or functions; details thereof.

Fixed and variable inductances; adaptations thereof for specific applications or functions; details thereof.

Electromagnets including, for example, superconductive magnets; details thereof such as coils, cores, yokes, and armatures.

Permanent magnets.

Thin magnetic films.

Magnetic materials.

Apparatus or processes for magnetizing or demagnetizing.

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

References relevant to classification in this subclass

This subclass does not cover:

Examples of places where the subject matter of this subclass is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Magnets used to separate solid materials from other solid materials or fluids

B03C 1/00

Magnetic work holders

B23Q 3/00, B25B 11/00

Apparatus or processes for degaussing ships

B63G 9/06

Lifting magnets

B66C 1/00

Magnets in electric meters

G01R

Devices for demagnetizing parts of clocks and watches

G04D 9/00

Magnetic record carriers

G11B 5/00

Apparatus or processes specially adapted for manufacturing magnetic record carriers

G11B 5/84

Thin-film magnetic stores

G11C

Apparatus or processes for threading magnetic cores in digital storage elements

G11C 5/12

Magnets or electromagnets in relays

H01H

Magnets or electromagnets in dynamo-electric machines

H02K

Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing dynamo-electric machines, e.g. forming windings prior to mounting into the machine

H02K 15/00

Arrangements for controlling transformers, reactors or choke coils for the purpose of obtaining a desired output

H02P 13/00

Magnetic amplifiers

H03F

Impedance networks

H03H

Demagnetizing arrangements for color television

H04N 9/29

Acoustic electromechanical transducers having coils or permanent magnets

H04R

Informative references

Attention is drawn to the following places, which may be of interest for search:

Powder metallurgy

B22F

Iron oxides (not sintered)

C01G 49/02

Ferrite based ceramics

C04B 35/26

Ferrous alloys

C22C

Coating by evaporation or sputtering

C23C 14/00

Refrigeration machines using magnetic effects

F25B 21/00

Magneto-optical devices

G02F 1/09

Sensing record carriers using inductive or magnetic sensors

G06K 7/08

Semiconductor devices with potential-jump barrier or surface barrier controllable by variation of the magnetic field applied to the devices

H01L 29/82

Thermomagnetic devices

H01L 37/00

Magnetostrictive devices

H01L 41/12

Devices using galvano-magnetic or similar magnetic effects

H01L 43/00

Screening of electric apparatus against magnetic fields

H05K 9/00

Special rules of classification

Groups H01F 17/00-H01F 38/00 (with the exception of groups H01F 27/42 and 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.