IPC Subgroup
H03F 1/08 Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
Introduced: September 1968
Last revised: January 2006
Full Title
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements > Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- AMPLIFIERS
Additional Content
Wide-band amplifiers with inter-stage coupling networks incorporating these impedances
5 direct subcodes
Child Classifications
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- H03F 1/1 by use of amplifying elements with multiple electrode connections
- H03F 1/12 by use of attenuating means
- H03F 1/14 by use of neutralising means
- H03F 1/18 by use of distributed coupling
- H03F 1/22 by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
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