DIFF Subgroup
H02K 9/19 for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Arrangements for cooling or ventilating > for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
CPC:
Arrangements for cooling or ventilating (channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24) > for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
Child Classifications
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- H02K 9/193 with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium IPC+CPC Available in IPC and CPC
- 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 IPC+CPC Available in IPC and CPC
- H02K 9/20 wherein the cooling medium vaporises within the machine casing IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
Class H02,2013–2023, worldwide · Source: EPO PATSTAT
- SGCC(STATE GRID CORPORATION OF CHINA) 24,515
- MITSUBISHI ELECTRIC CORPORATION JP 11,346
- SIEMENS DE 9,026
- ROBERT BOSCH DE 9,005
- SAMSUNG ELECTRONICS COMPANY KR 6,729
- GUANGDONG POWER GRID CORPORATION 5,740
- DENSO CORPORATION JP 5,077
- LG ELECTRONICS KR 5,041
- LG INNOTEK COMPANY KR 4,442
- TOYOTA MOTOR CORPORATION 4,349