DIFF Subgroup
H02M 3/28 using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
Introduced: September 1968
Full Title
Conversion of DC power input into DC power output > with intermediate conversion into AC > by static converters > using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 1974.
Child Classifications
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- H02M 3/305 using devices of a thyratron or thyristor type requiring extinguishing means since 1974 IPC+CPC Available in IPC and CPC
- H02M 3/325 using devices of a triode or a transistor type requiring continuous application of a control signal since 1974 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