IPC Subgroup
H01P 1/207 Hollow waveguide filters
Introduced: January 1980
Last revised: January 2006
Full Title
Auxiliary devices > Frequency-selective devices, e.g. filters > Hollow waveguide filters
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- WAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE
3 direct subcodes
Child Classifications
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- H01P 1/208 Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P 1/209 comprising one or more branching arms or cavities wholly outside the main waveguide
- H01P 1/211 Waffle-iron filters; Corrugated structures
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