by variation of field (H02P9/08, H02P9/10 take precedence)

Full Title

Arrangements for controlling electric generators for the purpose of obtaining a desired output > by variation of field (H02P9/08, H02P9/10 take precedence)

Filing statistics

CPC H02P 9/14 belongs to the parent subclass H02P, which recorded 107,088 patent applications worldwide between 2013 and 2023. Annual filings grew from 6,554 in 2013 to 9,861 in 2023 (+50%), peaking at 11,737 applications in 2018. The most active applicants in class H02 are SGCC(STATE GRID CORPORATION OF CHINA) (24,515 applications), MITSUBISHI ELECTRIC CORPORATION (11,346 applications) and SIEMENS (9,026 applications).

Source: EPO PATSTAT, worldwide filings

8 direct subcodes

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
H02P 9/20 due to variation of continuously-variable ohmic resistance
H02P 9/24 due to variation of make-to-break ratio of intermittently-operating contacts, e.g. using Tirrill regulator
H02P 9/26 using discharge tubes or semiconductor devices (H02P9/34 takes precedence)
H02P 9/32 using magnetic devices with controllable degree of saturation (H02P9/34 takes precedence)
H02P 9/34 using magnetic devices with controllable degree of saturation in combination with controlled discharge tube or controlled semiconductor device
H02P 9/36 using armature-reaction-excited machines
H02P 9/38 Self-excitation by current derived from rectification of both output voltage and output current of generator

Top Applicants

Top 10 applicants by patent filingsfor 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