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PCE
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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

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