Assignee
PHOTO SYSTEMS INC
4 granted patents·68 citations·filing 1974–1975
Top patents by PatentIndex Score
4 records- 0189US3982825AColor filter head for photographic enlargersPHOTO SYSTEMS INC·Filed 1974·Granted Sep 28, 1976·20 cites·20 claims
- 0281US3952437APicture frame constructionPHOTO SYSTEMS INC·Filed 1974·Granted Apr 27, 1976·45 cites·14 claims
- 0338US4016585ACenter filling variable volume film drumPHOTO SYSTEMS INC·Filed 1975·Granted Apr 5, 1977·3 cites·9 claims
- 0430US3944363AFocusing device and method of use thereof for photographic enlargerPHOTO SYSTEMS INC·Filed 1974·Granted Mar 16, 1976·0 cites·11 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →