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IPC Subgroup
H02P 9/18

the switching being caused by a servomotor, measuring instrument, or relay

Introduced: September 1968

Last revised: January 2006

Full Title

Arrangements for controlling electric generators for the purpose of obtaining a desired output > by variation of field > due to variation of ohmic resistance in field circuit, using resistances switched in or out of circuit step by step > the switching being caused by a servomotor, measuring instrument, or relay

Classification Context

Section:
ELECTRICITY
Class:
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
Subclass:
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

Filing statistics

IPC H02P 9/18 belongs to the parent subclass H02P, which recorded 122,940 patent applications worldwide between 2013 and 2023. Annual filings grew from 9,364 in 2013 to 11,656 in 2023 (+24%), peaking at 12,542 applications in 2020. 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

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