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PCE
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CPC Subgroup
G09B 3/10

wherein one set of answers is common to a plurality of questions

Full Title

Manually or mechanically operated teaching appliances working with questions and answers (electrically-operated G09B7/00; advertising or displaying in general G09F) > of the multiple-choice answer type, i.e. where a given question is provided with a series of answers and a choice has to be made > wherein one set of answers is common to a plurality of questions

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Child Classifications

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Top Applicants

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

  1. SAMSUNG DISPLAY KR 22,477
  2. BOE TECHNOLOGY GROUP COMPANY CN 16,016
  3. BOE TECHNOLOGY GROUP COMPANY 12,918
  4. LG DISPLAY COMPANY KR 12,599
  5. SAMSUNG ELECTRONICS COMPANY KR 12,009
  6. SAMSUNG DISPLAY 6,252
  7. SEMICONDUCTOR ENERGY LABORATORY COMPANY JP 4,410
  8. SONY CORPORATION JP 3,965
  9. LG ELECTRONICS KR 3,901
  10. LG DISPLAY COMPANY 3,705