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| All Patents in class 396/524 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,431,908 | Oct. 10, 1922 | W.F. Folmer | Cut Film Magazine | film and plate holders | |
| 1,631,479 | Jun. 07, 1927 | W.F. Folmer | Cut Film Holders | film and plate holders | |
| 2,056,144 | Sep. 29, 1936 | C.H. Roth | Light Valve for Plate or Film Holders | film and plate holders | |
| 2,339,658 | Jan. 18, 1944 | B.L. Smith | Film Holder with Light Valves or Guards | film and plate holders | |
| D302,434 | Jul. 25, 1989 | J.R. Cawthorne | Film Holder | film and plate holders | |