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IPC Subgroup
G03B 27/72

Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Introduced: September 1968

Last revised: January 2006

Full Title

Photographic printing apparatus > Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Classification Context

Section:
PHYSICS
Class:
PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
Subclass:
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR

3 direct subcodes

Child Classifications

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  • G03B 27/73 Controlling exposure by variation of spectral composition, e.g. multicolor printers
  • G03B 27/74 Positioning exposure meters in the apparatus
  • G03B 27/8 in dependence upon automatic analysis of the original

Top Applicants

Top 10 applicants by patent filingsfor class G03, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CANON 31,416
  2. CANON JP 17,469
  3. KYOCERA DOCUMENT SOLUTIONS 9,845
  4. RICOH COMPANY 9,807
  5. ASML NETHERLANDS NL 9,427
  6. FUJIFILM JP 7,225
  7. KONICA MINOLTA CORPORATION 7,216
  8. FUJI XEROX COMPANY 5,711
  9. CARL ZEISS SMT DE 4,971
  10. RICOH COMPANY JP 4,123