DIFF Main Group
H03K 21/00 Details of pulse counters or frequency dividers
Introduced: September 1968
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H03K 21/16 Circuits for carrying over pulses between successive decades IPC+CPC Available in IPC and CPC
- H03K 21/38 Starting, stopping or resetting the counter (counters with a base other than a power of two H03K23/48, H03K23/66) since 1985 IPC+CPC Available in IPC and CPC
- H03K 21/40 Monitoring; Error detection; Preventing or correcting improper counter operation since 1985 +2 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
Class H03,2013–2023, worldwide · Source: EPO PATSTAT
- SAMSUNG ELECTRONICS COMPANY KR 7,293
- QUALCOMM US 7,085
- MURATA MANUFACTURING COMPANY JP 5,982
- HUAWEI TECHNOLOGIES COMPANY CN 4,641
- INTEL CORPORATION US 3,863
- TEXAS INSTRUMENTS US 3,409
- MURATA MANUFACTURING COMPANY 2,874
- SK HYNIX KR 2,644
- SKYWORKS SOLUTIONS US 2,545
- IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,437