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IPC Main Group
H01H 29/00

Switches having at least one liquid contact

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC ELEMENTS
Subclass:
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES

Filing statistics

IPC H01H 29/00 belongs to the parent subclass H01H, which recorded 242,774 patent applications worldwide between 2013 and 2023. Annual filings grew from 16,532 in 2013 to 24,974 in 2023 (+51%), peaking at 27,753 applications in 2020. The most active applicants in class H01 are TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY (43,574 applications), SAMSUNG ELECTRONICS COMPANY (42,206 applications) and LG CHEM (21,383 applications).

Source: EPO PATSTAT, worldwide filings

8 direct subcodes

Child Classifications

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  • H01H 29/16 operated by dipping solid contact into stationary contact liquid
  • H01H 29/18 with level of surface of contact liquid displaced by non-electrical contact-making plunger
  • H01H 29/26 with level of surface of contact liquid displaced by centrifugal action
  • H01H 29/28 with level of surface of contact liquid displaced by fluid pressure
  • H01H 29/3 with level of surface of contact liquid displaced by expansion or evaporation thereof
  • H01H 29/32 with contact made by a liquid jet, e.g. earthing switch with contact made by jet of water

Top Applicants

Top 10 applicants by patent filingsfor class H01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 43,574
  2. SAMSUNG ELECTRONICS COMPANY KR 42,206
  3. LG CHEM KR 21,383
  4. APPLIED MATERIALS US 20,441
  5. LG ENERGY SOLUTION KR 20,279
  6. SAMSUNG DISPLAY KR 19,725
  7. CHINESE ACADEMY OF SCIENCES 19,400
  8. TOYOTA MOTOR CORPORATION 18,819
  9. SGCC(STATE GRID CORPORATION OF CHINA) 18,082
  10. TOKYO ELECTRON JP 17,634