US4176938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll film cassette
Assignee: Agfa Gevaert AG
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Filing: 1978-07-07
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Granted: 1979-12-04
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Expires: 1998-07-07
Abstract
Abstract A roll film cassette has a film storage chamber and a film take-up chamber; these are connected by a web along which the film moves as it travels from the storage chamber to the take-up chamber. The web is provided adjacent the inlet to the take-up chamber with a springy detent a projection of which rides on the film and snaps into a perforation formed adjacent the film end in the film and/or in an end paper of the same. This prevents the film end from slipping into the take-up chamber and becoming inaccessible.
Inventors
- 👤 Rudolf Weiss
- 👤 Werner Kiessling
- 👤 Otto Wiedemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:19
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A roll film cassette, comprising a film supply chamber for unexposed film and having a film outlet; a film take-up chamber for exposed film and having a film inlet; a web connecting said chambers and having a film window across which the film travels in a plane from said outlet to said inlet; and means on said cassette, including a springy arm intermediate said film window and said inlet and normally extending substantially parallel to said plane, said arm having a free end closer to said inlet than to said window and provided with a projection riding on the film for engaging in a cut-out proximal to a trailing end of the film when the same approaches said inlet so as to prevent the trailing film end from entering said inlet.
Claim 2
Dependent Claim
131 words
A roll film cassette, comprising a film supply chamber for unexposed film and having a film outlet; a film take-up chamber for exposed film and having a film inlet; a web connecting said chambers and having a film window across which the film travels in a plane from said outlet to said inlet; and means on said cassette, including a springy arm intermediate said film window and said inlet and normally extending substantially parallel to said plane, said arm having a free end closer to said inlet than to said window and provided with a projection riding on the film for engaging in a cut-out proximal to a trailing end of the film when the same approaches said inlet so as to prevent the trailing film end from entering said inlet.
Claim 3
Dependent Claim
17 words
A roll film cassette as defined in claim 1, wherein said arm is provided on said web.
Claim 4
Dependent Claim
19 words
A roll film cassette as defined in claim 2, wherein said arm is of one piece with said web.
Claim 5
Dependent Claim
55 words
A roll film cassette as defined in claim 1, wherein a trailing end portion of the film has a protective strip connected to it and extending rearwardly beyond the trailing film end, said cut-out being provided in said trailing end portion and the strip being provided with another cut-out in registry with the first-mentioned cut-out.
Claim 6
Dependent Claim
48 words
A roll film cassette as defined in claim 1, wherein a trailing end portion of the film has a protective strip connected to it and extending rearwardly beyond the trailing film end, said cut-out being provided in said strip rearwardly of but proximal to said trailing film end.
Claim 7
Dependent Claim
28 words
A roll film cassette as defined in claim 1, wherein said projection and the cut-out are located laterally spaced from a row of film-transporting perforations in the film.
Claim 8
Dependent Claim
29 words
A roll film cassette as defined in claim 1, wherein said projections and the cut-out have dimensions which are larger than those of film-transporting perforations provided in the film.
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) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |