H03K 3/28 using means other than a transformer for feedback
Introduced: September 1968
Last revised: January 2006
Full Title
Circuits for generating electric pulses; Monostable, bistable or multistable circuits > Generators characterised by the type of circuit or by the means used for producing pulses > by the use, as active elements, of bipolar transistors with internal or external positive feedback > using means other than a transformer for feedback
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- PULSE TECHNIQUE
Filing statistics
IPC H03K 3/28 belongs to the parent subclass H03K, which recorded 110,917 patent applications worldwide between 2013 and 2023. Annual filings grew from 8,678 in 2013 to 10,761 in 2023 (+24%), peaking at 11,161 applications in 2020. 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
1 direct subcode
Child Classifications
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- H03K 3/281 using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
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