IPC Subgroup
H03H 7/12 Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
Introduced: September 1968
Last revised: January 2006
Full Title
Multiple-port networks comprising only passive electrical elements as network components > Frequency selective two-port networks > Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
Additional Content
Filters comprising mutual inductance
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