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IPC Main Group
G09D 3/00

Perpetual calendars

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
PHYSICS
Class:
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
Subclass:
RAILWAY OR LIKE TIME OR FARE TABLES; PERPETUAL CALENDARS

Filing statistics

IPC G09D 3/00 belongs to the parent subclass G09D, which recorded 687 patent applications worldwide between 2013 and 2023. Annual filings declined from 87 in 2013 to 44 in 2023 (-49%). The most active applicants in class G09 are SAMSUNG DISPLAY (16,046 applications), BOE TECHNOLOGY GROUP COMPANY (13,766 applications) and BOE TECHNOLOGY GROUP COMPANY (12,804 applications).

Source: EPO PATSTAT, worldwide filings

Related Keywords

perpetual CALENDAR(S)

3 direct subcodes

Child Classifications

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  • G09D 3/02 with interchangeable members bearing the indicia
  • G09D 3/12 electrically operated

Top Applicants

Top 10 applicants by patent filingsfor class G09, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SAMSUNG DISPLAY KR 16,046
  2. BOE TECHNOLOGY GROUP COMPANY 13,766
  3. BOE TECHNOLOGY GROUP COMPANY CN 12,804
  4. LG DISPLAY COMPANY KR 10,322
  5. SAMSUNG ELECTRONICS COMPANY KR 7,738
  6. SAMSUNG DISPLAY 5,172
  7. SEMICONDUCTOR ENERGY LABORATORY COMPANY 4,749
  8. SEMICONDUCTOR ENERGY LABORATORY COMPANY JP 3,417
  9. LG DISPLAY COMPANY 3,335
  10. SONY CORPORATION JP 3,179