H02H 3/26 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
Introduced: September 1968
Last revised: January 2006
Full Title
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection > responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
Classification Context
- Section:
- ELECTRICITY
- Class:
- GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
- Subclass:
- EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
Filing statistics
IPC H02H 3/26 belongs to the parent subclass H02H, which recorded 123,243 patent applications worldwide between 2013 and 2023. Annual filings grew from 8,840 in 2013 to 13,605 in 2023 (+54%). The most active applicants in class H02 are SGCC(STATE GRID CORPORATION OF CHINA) (54,496 applications), MITSUBISHI ELECTRIC CORPORATION (10,495 applications) and TOYOTA MOTOR CORPORATION (9,464 applications).
Source: EPO PATSTAT, worldwide filings
3 direct subcodes
Child Classifications
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- H02H 3/28 involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H 3/32 involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H 3/36 involving comparison of the voltage or current values at corresponding points of different systems, e.g. of parallel feeder systems
Top Applicants
Top 10 applicants by patent filingsfor class H02, 2013–2023, worldwide · Source: EPO PATSTAT
- SGCC(STATE GRID CORPORATION OF CHINA) 54,496
- MITSUBISHI ELECTRIC CORPORATION JP 10,495
- TOYOTA MOTOR CORPORATION 9,464
- GUANGDONG POWER GRID CORPORATION 9,339
- ROBERT BOSCH DE 8,226
- SIEMENS DE 8,218
- DENSO CORPORATION 7,063
- MITSUBISHI ELECTRIC CORPORATION 6,619
- SAMSUNG ELECTRONICS COMPANY KR 5,826
- GREE ELECTRIC APPLIANCES 5,094