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IPC Subgroup
H02K 9/197

in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Introduced: September 1968

Last revised: January 2006

Full Title

Arrangements for cooling or ventilating > for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil > in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Classification Context

Section:
ELECTRICITY
Class:
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
Subclass:
DYNAMO-ELECTRIC MACHINES

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