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IPC Subgroup
H03C 1/08

by means of variable impedance element

Introduced: September 1968

Last revised: January 2006

Full Title

Amplitude modulation > by means of variable impedance element

Classification Context

Section:
ELECTRICITY
Class:
ELECTRONIC CIRCUITRY
Subclass:
MODULATION

Additional Content

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

3 direct subcodes

Child Classifications

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  • H03C 1/1 the element being a current-dependent inductor
  • H03C 1/12 the element being a voltage-dependent capacitor
  • H03C 1/14 the element being a diode

Top Applicants

Top 10 applicants by patent filingsfor 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