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IPC Subgroup
H02H 5/08

responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays

Introduced: September 1968

Last revised: January 2006

Full Title

Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection > responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays

Classification Context

Section:
ELECTRICITY
Class:
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
Subclass:
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS

Related Keywords

electric protective circuits responsive to LEVEL(S) of liquidelectric protective circuits responsive to PRESSURE

Top Applicants

Top 10 applicants by patent filingsfor class H02, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SGCC(STATE GRID CORPORATION OF CHINA) 54,496
  2. MITSUBISHI ELECTRIC CORPORATION JP 10,495
  3. TOYOTA MOTOR CORPORATION 9,464
  4. GUANGDONG POWER GRID CORPORATION 9,339
  5. ROBERT BOSCH DE 8,226
  6. SIEMENS DE 8,218
  7. DENSO CORPORATION 7,063
  8. MITSUBISHI ELECTRIC CORPORATION 6,619
  9. SAMSUNG ELECTRONICS COMPANY KR 5,826
  10. GREE ELECTRIC APPLIANCES 5,094