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IPC Subgroup
H03D 3/08

by means of diodes, e.g. Foster-Seeley discriminator

Introduced: September 1968

Last revised: January 2006

Full Title

Demodulation of angle-modulated oscillations > by detecting phase difference between two signals obtained from input signal > by combining signals additively or in product demodulators > by means of diodes, e.g. Foster-Seeley discriminator

Classification Context

Section:
ELECTRICITY
Class:
ELECTRONIC CIRCUITRY
Subclass:
DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER

1 direct subcode

Child Classifications

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  • H03D 3/1 in which the diodes are simultaneously conducting during the same half period of the signal, e.g. ratio detector

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