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PCE
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DIFF Subgroup
H04R 1/34

by using a single transducer with sound reflecting, diffracting, directing or guiding means

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of transducers > Arrangements for obtaining desired frequency or directional characteristics > for obtaining desired directional characteristic only > by using a single transducer with sound reflecting, diffracting, directing or guiding means

CPC:

Details of transducers, > Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) > for obtaining desired directional characteristic only > by using a single transducer with sound reflecting, diffracting, directing or guiding means

Additional Content IPC

Arrangements specially adapted for hearing aids

Of 4 combined children, 2 exist in both systems.

2 codes are CPC-only extensions.

Child Classifications

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  • H04R 1/342 CPC only CPC only
  • H04R 1/36 by using a single aperture of dimensions not greater than the shortest operating wavelength IPC+CPC Available in IPC and CPC
  • H04R 1/38 in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

  1. QUALCOMM US 97,396
  2. HUAWEI TECHNOLOGIES COMPANY CN 96,502
  3. SAMSUNG ELECTRONICS COMPANY KR 86,981
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
  5. HUAWEI TECHNOLOGIES COMPANY 55,349
  6. LG ELECTRONICS KR 53,649
  7. CANON 33,341
  8. SONY CORPORATION JP 32,761
  9. ZTE CORPORATION CN 32,274
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327

Top Applicants (CPC)

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

  1. HUAWEI TECHNOLOGIES COMPANY CN 101,476
  2. QUALCOMM US 101,139
  3. SAMSUNG ELECTRONICS COMPANY KR 96,655
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
  5. LG ELECTRONICS KR 55,253
  6. HUAWEI TECHNOLOGIES COMPANY 54,181
  7. SONY CORPORATION JP 35,309
  8. ZTE CORPORATION CN 32,950
  9. INTEL CORPORATION US 27,533
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498