DIFF Subgroup
H03H 11/44 Negative impedance converters (H03H11/42 takes precedence)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Negative impedance converters
CPC: Negative impedance converters (H03H11/42 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Networks using active elements > Multiple-port networks > Impedance converters > Negative impedance converters
CPC:
Networks using active elements > Multiple-port networks > Impedance converters > Negative impedance converters (H03H11/42 takes precedence)
Additional Content IPC
Limiting references
Gyrators
Application references
Negative impedance converters used in frequency-selective networks
No child classifications to compare. This is a leaf node in both 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