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IPC Subgroup
G05F 1/63

using variable impedances in series with the load as final control devices

Introduced: January 1985

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 it is irrelevant whether the variable actually regulated is AC or DC > using variable impedances in series with the load as final control devices

Classification Context

Section:
PHYSICS
Class:
CONTROLLING; REGULATING
Subclass:
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

Filing statistics

IPC G05F 1/63 belongs to the parent subclass G05F, which recorded 38,687 patent applications worldwide between 2013 and 2023. Annual filings declined from 3,937 in 2013 to 3,173 in 2023 (-19%). The most active applicants in class G05 are SIEMENS (4,725 applications), SGCC(STATE GRID CORPORATION OF CHINA) (4,571 applications) and FANUC (4,233 applications).

Source: EPO PATSTAT, worldwide filings

3 direct subcodes

Child Classifications

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  • G05F 1/635 being Hall effect devices, magnetoresistors or thermistors
  • G05F 1/644 being pressure-sensitive resistors
  • G05F 1/648 being plural resistors among which a selection is made

Top Applicants

Top 10 applicants by patent filingsfor class G05, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SIEMENS DE 4,725
  2. SGCC(STATE GRID CORPORATION OF CHINA) 4,571
  3. FANUC JP 4,233
  4. MITSUBISHI ELECTRIC CORPORATION JP 3,143
  5. FANUC 2,981
  6. ROBERT BOSCH DE 2,813
  7. CHINESE ACADEMY OF SCIENCES 2,500
  8. LG ELECTRONICS KR 2,182
  9. OMRON CORPORATION JP 2,036
  10. SAMSUNG ELECTRONICS COMPANY KR 1,981