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IPC Subgroup
H03D 3/02

by detecting phase difference between two signals obtained from input signal

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

Classification Context

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

Filing statistics

IPC H03D 3/02 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

Modifications of demodulators to reduce effects of temperature variations By means of transit-time tubes By deflecting an electron beam in a discharge tube

5 direct subcodes

Child Classifications

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  • H03D 3/04 by counting or integrating cycles of oscillations
  • H03D 3/22 by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector
  • H03D 3/24 Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits

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