IPC Subgroup
G05F 1/607 using discharge tubes in parallel with the load as final control devices
Introduced: January 1980
Last revised: January 2006
Full Title
Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems > Regulating voltage or current > wherein the variable actually regulated by the final control device is DC > using discharge tubes in parallel with the load as final control devices
Classification Context
- Section:
- PHYSICS
- Class:
- CONTROLLING; REGULATING
- Subclass:
- SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
1 direct subcode
Child Classifications
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- G05F 1/61 including two stages of regulation, at least one of which is output level responsive
Top Applicants
Top 10 applicants by patent filingsfor class G05, 2013–2023, worldwide · Source: EPO PATSTAT
- SIEMENS DE 4,725
- SGCC(STATE GRID CORPORATION OF CHINA) 4,571
- FANUC JP 4,233
- MITSUBISHI ELECTRIC CORPORATION JP 3,143
- FANUC 2,981
- ROBERT BOSCH DE 2,813
- CHINESE ACADEMY OF SCIENCES 2,500
- LG ELECTRONICS KR 2,182
- OMRON CORPORATION JP 2,036
- SAMSUNG ELECTRONICS COMPANY KR 1,981