IPC Subgroup
H01P 1/2 Frequency-selective devices, e.g. filters
Introduced: September 1968
Last revised: January 2006
Full Title
Auxiliary devices > Frequency-selective devices, e.g. filters
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- WAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE
Related Keywords
FILTER(S) of waveguide typewaveguide devices for FREQUENCY selection
6 direct subcodes
Child Classifications
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- H01P 1/201 Filters for transverse electromagnetic waves
- H01P 1/207 Hollow waveguide filters
- H01P 1/212 suppressing or attenuating harmonic frequencies
- H01P 1/213 combining or separating two or more different frequencies
- H01P 1/215 using ferromagnetic material
- H01P 1/219 Evanescent mode filters
Top Applicants
Top 10 applicants by patent filingsfor class H01, 2013–2023, worldwide · Source: EPO PATSTAT
- TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 43,574
- SAMSUNG ELECTRONICS COMPANY KR 42,206
- LG CHEM KR 21,383
- APPLIED MATERIALS US 20,441
- LG ENERGY SOLUTION KR 20,279
- SAMSUNG DISPLAY KR 19,725
- CHINESE ACADEMY OF SCIENCES 19,400
- TOYOTA MOTOR CORPORATION 18,819
- SGCC(STATE GRID CORPORATION OF CHINA) 18,082
- TOKYO ELECTRON JP 17,634