IPC Main Group
H04R 1/00 Details of transducers
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
Additional Content
Glossary
Casing Cabinet Cabinets Casings housing, enclosure
Limiting references
Mountings specially adapted for telephone equipment Diaphragms for electromechanical transducers Details of transducers characterised by the nature of the transducer
11 direct subcodes
Child Classifications
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- H04R 1/02 Casings; Cabinets; Mountings therein
- H04R 1/06 Arranging circuit leads; Relieving strain on circuit leads
- H04R 1/08 Mouthpieces; Attachments therefor
- H04R 1/1 Earpieces; Attachments therefor
- H04R 1/12 Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection
- H04R 1/14 Throat mountings for microphones
- H04R 1/16 Mounting or connecting stylus to transducer with or without damping means
- H04R 1/2 Arrangements for obtaining desired frequency or directional characteristics
- H04R 1/42 Combinations of transducers with fluid-pressure or other non-electrical amplifying means
- H04R 1/44 Special adaptations for subaqueous use, e.g. for hydrophone
- H04R 1/46 Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 97,396
- HUAWEI TECHNOLOGIES COMPANY CN 96,502
- SAMSUNG ELECTRONICS COMPANY KR 86,981
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
- HUAWEI TECHNOLOGIES COMPANY 55,349
- LG ELECTRONICS KR 53,649
- CANON 33,341
- SONY CORPORATION JP 32,761
- ZTE CORPORATION CN 32,274
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327