DIFF Subgroup
H02P 9/14 by variation of field (H02P9/08, H02P9/10 take precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: by variation of field
CPC: by variation of field (H02P9/08, H02P9/10 take precedence)
Full Title
Full titles differ between systems:
IPC:
Arrangements for controlling electric generators for the purpose of obtaining a desired output > by variation of field
CPC:
Arrangements for controlling electric generators for the purpose of obtaining a desired output > by variation of field (H02P9/08, H02P9/10 take precedence)
IPC and CPC are identically structured here. All 8 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H02P 9/16 due to variation of ohmic resistance in field circuit, using resistances switched in or out of circuit step by step IPC+CPC Available in IPC and CPC
- H02P 9/20 due to variation of continuously-variable ohmic resistance IPC+CPC Available in IPC and CPC
- H02P 9/24 due to variation of make-to-break ratio of intermittently-operating contacts, e.g. using Tirrill regulator IPC+CPC Available in IPC and CPC
- H02P 9/26 using discharge tubes or semiconductor devices (H02P9/34 takes precedence) IPC+CPC Available in IPC and CPC
- H02P 9/32 using magnetic devices with controllable degree of saturation (H02P9/34 takes precedence) IPC+CPC Available in IPC and CPC
- H02P 9/34 using magnetic devices with controllable degree of saturation in combination with controlled discharge tube or controlled semiconductor device IPC+CPC Available in IPC and CPC
- H02P 9/38 Self-excitation by current derived from rectification of both output voltage and output current of generator 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