IPC Definitions - January 01, 2012
H01F - Definition
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:
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 |
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.