CPC Subgroup
B41B 21/02 Shutters in optical systems (in general G03B)
Full Title
Common details of photographic composing machines of the kinds covered in groups B41B17/00 and B41B19/00 > Shutters in optical systems (in general G03B)
2 direct subcodes
Child Classifications
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- B41B 21/04 for selecting characters
- B41B 21/06 for adjusting exposures
Top Applicants
Top 10 applicants by patent filingsfor 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