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DIFF Main Group
H03D 3/00

Demodulation of angle-, modulated oscillations (H03D5/00, H03D9/00, H03D11/00 take precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Demodulation of angle-modulated oscillations

CPC: Demodulation of angle-, modulated oscillations (H03D5/00, H03D9/00, H03D11/00 take precedence)

Full Title

Full titles differ between systems:

IPC:

Demodulation of angle-modulated oscillations

CPC:

Demodulation of angle-, modulated oscillations (H03D5/00, H03D9/00, H03D11/00 take precedence)

Additional Content IPC

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

Of 9 combined children, 6 exist in both systems.

3 codes are CPC-only extensions.

5 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • H03D 3/006 CPC only CPC only
  • H03D 3/26 by means of sloping amplitude/frequency characteristic of tuned or reactive circuit (H03D3/28 - H03D3/32 takes precedence) IPC+CPC Available in IPC and CPC
  • H03D 3/28 Modifications of demodulators to reduce effects of temperature variations (; automatic frequency control H03L) IPC+CPC Available in IPC and CPC
  • H03D 3/30 by means of transit-time tubes IPC+CPC Available in IPC and CPC
  • H03D 3/32 by deflecting an electron beam in a discharge tube (H03D3/30 takes precedence) IPC+CPC Available in IPC and CPC
  • H03D 3/34 by means of electromechanical devices (H03D3/16 takes precedence) since 1980 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