MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (ceramics based on ferrites C04B35/26; alloys C22C ; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H04R; thermomagnetic devices H10N15/00)

Child Classifications

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• H01F 1/00 Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
• H01F 10/00 Thin magnetic films, e.g. of one-domain structure (magnetic record carriers G11B5/00; thin-film magnetic stores G11C)
• H01F 13/00 Apparatus or processes for magnetising or demagnetising ( ; for degaussing ships B63G9/06; for clocks or watches G04D9/00; ; demagnetising arrangements for colour television H04N9/29)
• H01F 17/00 Fixed inductances of the signal type
• H01F 19/00 Fixed transformers or mutual inductances of the signal type (H01F36/00 takes precedence)
• H01F 21/00 Variable inductances or transformers of the signal type (H01F36/00 takes precedence)
• H01F 27/00 Details of transformers or inductances, in general
• H01F 29/00 Variable transformers or inductances not covered by group H01F21/00
• H01F 3/00 Cores, Yokes, or armatures (magnetic materials H01F1/00; permanent magnets H01F7/02)
• H01F 30/00 Fixed transformers not covered by group H01F19/00
• H01F 36/00 Transformers with superconductive windings or with windings operating at cryogenic temperature (superconducting magnets or superconducting coils H01F6/00)
• H01F 37/00 Fixed inductances not covered by group H01F17/00
• H01F 38/00 Adaptations of transformers or inductances for specific applications or functions
• H01F 41/00 Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
• H01F 5/00 Coils (superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00)
• H01F 6/00 Superconducting magnets; Superconducting coils
• H01F 7/00 Magnets (superconducting magnets H01F6/00; for separation of solid materials or fluids B03C1/00; for bench or like work-holders B23B31/28, B23Q3/00; work-holding devices B25B11/00; lifting magnets B66C1/00; ; for electric meters G01R; for relays H01H; ; for dynamo-electric machines H02K)