IPC Main Group
H03C 1/00 Amplitude modulation
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- MODULATION
Filing statistics
IPC H03C 1/00 belongs to the parent subclass H03C, which recorded 1,283 patent applications worldwide between 2013 and 2023. Annual filings declined from 191 in 2013 to 71 in 2023 (-63%). 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
Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal Modulating electromagnetic waves
Related Keywords
modulating AMPLITUDE of electric sinusoidal oscilations
12 direct subcodes
Child Classifications
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- H03C 1/02 Details
- H03C 1/08 by means of variable impedance element
- H03C 1/16 by means of discharge device having at least three electrodes
- H03C 1/28 by means of transit-time tube
- H03C 1/32 by deflection of electron beam in discharge tube
- H03C 1/34 by means of light-sensitive element
- H03C 1/36 by means of semiconductor device having at least three electrodes
- H03C 1/46 Modulators with mechanically-driven or acoustically-driven parts
- H03C 1/48 by means of Hall-effect devices
- H03C 1/5 by converting angle modulation to amplitude modulation
- H03C 1/52 Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C 1/62 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
Top Applicants
Top 10 applicants by patent filingsfor class H03, 2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 5,625
- SAMSUNG ELECTRONICS COMPANY KR 5,496
- MURATA MANUFACTURING COMPANY JP 5,478
- HUAWEI TECHNOLOGIES COMPANY CN 3,383
- INTEL CORPORATION US 3,091
- TEXAS INSTRUMENTS US 3,070
- MURATA MANUFACTURING COMPANY 2,722
- SKYWORKS SOLUTIONS US 2,290
- SEIKO EPSON CORPORATION 2,177
- IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,158