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IPC Main Group
H03D 3/00

Demodulation of angle-modulated oscillations

Introduced: September 1968

Last revised: January 2006

Classification Context

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

Filing statistics

IPC H03D 3/00 belongs to the parent subclass H03D, which recorded 4,960 patent applications worldwide between 2013 and 2023. Annual filings declined from 574 in 2013 to 386 in 2023 (-33%). The most active applicants in class H03 are QUALCOMM (5,625 applications), SAMSUNG ELECTRONICS COMPANY (5,496 applications) and MURATA MANUFACTURING COMPANY (5,478 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Glossary

I/Q in-phase, quadrature

Limiting references

Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will Demodulation or transference of modulation of modulated electromagnetic waves Super-regenerative demodulator circuits Frequency demodulators adapted for digitally modulated-carrier systems, i.e. using frequency-shift keying Phase demodulators adapted for digitally modulated-carrier systems, i.e. using phase-shift keying

Related Keywords

DISCRIMINATORS for electric signalsFREQUENCY discriminatorsPHASE(S) discriminators

6 direct subcodes

Child Classifications

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  • H03D 3/26 by means of sloping amplitude/frequency characteristic of tuned or reactive circuit
  • H03D 3/28 Modifications of demodulators to reduce effect of temperature variations
  • H03D 3/3 by means of transit-time tubes
  • H03D 3/32 by deflecting an electron beam in a discharge tube
  • H03D 3/34 by means of electromechanical devices

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