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PCE
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DIFF Subgroup
H03C 1/08

by means of variable impedance element (H03C1/28 - H03C1/34, H03C1/46 - H03C1/52, H03C1/62 take precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: by means of variable impedance element

CPC: by means of variable impedance element (H03C1/28 - H03C1/34, H03C1/46 - H03C1/52, H03C1/62 take precedence)

Full Title

Full titles differ between systems:

IPC:

Amplitude modulation > by means of variable impedance element

CPC:

Amplitude modulation (H03C5/00, H03C7/00 take precedence) > by means of variable impedance element (H03C1/28 - H03C1/34, H03C1/46 - H03C1/52, H03C1/62 take precedence)

Additional Content IPC

Amplitude modulation by means of transit-time tube Amplitude modulation by means of a magnetron Amplitude modulation by deflection of electron beam in discharge tube Amplitude modulation by means of light-sensitive element Amplitude modulators with mechanically or acoustically driven parts Amplitude modulation by means of Hall-effect devices Amplitude modulation by converting angle modulation to amplitude modulation Amplitude modulators in which carrier or one side-band are wholly or partially suppressed Amplitude modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

Child Classifications

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  • H03C 1/10 the element being a current-dependent inductor IPC+CPC Available in IPC and CPC
  • H03C 1/12 the element being a voltage-dependent capacitor IPC+CPC Available in IPC and CPC
  • H03C 1/14 the element being a diode IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class H03,2013–2023, worldwide · Source: EPO PATSTAT

  1. QUALCOMM US 5,625
  2. SAMSUNG ELECTRONICS COMPANY KR 5,496
  3. MURATA MANUFACTURING COMPANY JP 5,478
  4. HUAWEI TECHNOLOGIES COMPANY CN 3,383
  5. INTEL CORPORATION US 3,091
  6. TEXAS INSTRUMENTS US 3,070
  7. MURATA MANUFACTURING COMPANY 2,722
  8. SKYWORKS SOLUTIONS US 2,290
  9. SEIKO EPSON CORPORATION 2,177
  10. IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,158

Top Applicants (CPC)

Class H03,2013–2023, worldwide · Source: EPO PATSTAT

  1. SAMSUNG ELECTRONICS COMPANY KR 7,293
  2. QUALCOMM US 7,085
  3. MURATA MANUFACTURING COMPANY JP 5,982
  4. HUAWEI TECHNOLOGIES COMPANY CN 4,641
  5. INTEL CORPORATION US 3,863
  6. TEXAS INSTRUMENTS US 3,409
  7. MURATA MANUFACTURING COMPANY 2,874
  8. SK HYNIX KR 2,644
  9. SKYWORKS SOLUTIONS US 2,545
  10. IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,437