DIFF Subgroup
B41B 21/16 Optical systems (shutters B41B21/02; light sources B41B21/08)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Optical systems
CPC: Optical systems (shutters B41B21/02; light sources B41B21/08)
Full Title
Full titles differ between systems:
IPC:
Common details of photographic composing machines of the kinds covered in groups and > Optical systems
CPC:
Common details of photographic composing machines of the kinds covered in groups B41B17/00 and B41B19/00 > Optical systems (shutters B41B21/02; light sources B41B21/08)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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Top Applicants
Top Applicants (IPC)
Class B41,2013–2023, worldwide · Source: EPO PATSTAT
- SEIKO EPSON CORPORATION 14,672
- CANON 14,153
- RICOH COMPANY 8,049
- SEIKO EPSON CORPORATION JP 8,044
- HEWLETT-PACKARD DEVELOPMENT COMPANY US 7,312
- BROTHER INDUSTRIES 6,887
- KYOCERA DOCUMENT SOLUTIONS 5,463
- CANON JP 5,001
- KONICA MINOLTA CORPORATION 4,512
- BROTHER INDUSTRIES JP 3,681
Top Applicants (CPC)
Class B41,2013–2023, worldwide · Source: EPO PATSTAT
- SEIKO EPSON CORPORATION 8,446
- SEIKO EPSON CORPORATION JP 8,438
- HEWLETT-PACKARD DEVELOPMENT COMPANY US 7,828
- CANON JP 5,419
- CANON 4,156
- BROTHER INDUSTRIES JP 3,763
- BROTHER INDUSTRIES 2,779
- RICOH COMPANY JP 2,717
- FUJIFILM JP 2,423
- RICOH COMPANY 1,739