US4487491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film pressure plate
Assignee: Fujifilm Holdings Corp
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Filing: 1983-04-19
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Granted: 1984-12-11
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Expires: 2003-04-19
Abstract
Abstract A film pressure plate comprising a plate having a large number of projections with their tops smoothly curved, to press the film without scratching it to hold it flat in the focal plane of the camera. The plate has leaf springs to press it against the film and is integrally molded of plastic.
Inventors
- 👤 Shozi Inaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:27
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/42; G03B1/48
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A film pressure plate for holding a film flat in the focal plane of a camera, comprising a plate member having a flat surface adapted to confront said film, a large number of projections formed on said flat surface and adapted to touch a said film, and leaf springs disposed at opposite sides of said plate member and tilted backward away from each other in directions away from said surface.
Claim 2
Dependent Claim
70 words
A film pressure plate for holding a film flat in the focal plane of a camera, comprising a plate member having a flat surface adapted to confront said film, a large number of projections formed on said flat surface and adapted to touch a said film, and leaf springs disposed at opposite sides of said plate member and tilted backward away from each other in directions away from said surface.
Claim 3
Dependent Claim
34 words
A film pressure plate as defined in claim 1, said leaf springs having slots therein at their ends remote from said surface for the reception of studs on the back cover of a camera.
Claim 4
Dependent Claim
135 words
In combination with a camera having a back cover, a film pressure plate for holding a film flat in the focal plane of the camera, said plate comprising a plate member having a flat surface adapted to confront a film and disposed on the side of said plate member which is opposite said cover, a large number of projections formed on said flat surface and adapted to touch said film and extending forwardly from said flat surface in a direction away from said back cover, leaf springs on opposite sides of said plate member inclined backwardly in opposite directions from each other away from said plate member and contacting said back cover, said leaf springs having slots in their ends remote from said plate member, and studs on said back cover disposed in said slots.
Claim 5
Dependent Claim
135 words
In combination with a camera having a back cover, a film pressure plate for holding a film flat in the focal plane of the camera, said plate comprising a plate member having a flat surface adapted to confront a film and disposed on the side of said plate member which is opposite said cover, a large number of projections formed on said flat surface and adapted to touch said film and extending forwardly from said flat surface in a direction away from said back cover, leaf springs on opposite sides of said plate member inclined backwardly in opposite directions from each other away from said plate member and contacting said back cover, said leaf springs having slots in their ends remote from said plate member, and studs on said back cover disposed in said slots.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |