Patent DE67364C successfully refreshed from Google Patents.
US3969740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film cassette
Assignee: Pentacon GmbH Foto und Feinwerktechnik
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Filing: 1974-12-23
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Granted: 1976-07-13
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Expires: 1994-12-23
Abstract
Abstract The film cassette comprises a storage and take-up chambers interconnected by a crosspiece. The crosspiece has a transport surface, which faces the camera lens when located in the camera, over which the film is guided and against which the film is pressed by an engagement surface of the camera film gate. The crosspiece is provided with a slot extending in the direction of film transport, the slot passes through the crosspiece, the length of the slot is at least equal to the distance between two successive transport holes in the film.
Inventors
- 👤 Werner Hahn
- 👤 Walter Hennig
- 👤 Bernhard Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:16
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30; G03B17/305
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
208 words
In a film cassette for roll film having transport perforations formed therein; said cassette being suitable for use with cameras having a housing adapted to receive said cassette and a film gate with a film engagement surface therein and film transport mechanism having a drive member engageable with said perforations in said film and performing driving strokes, said cassette comprising: a. a storage chamber for housing said film: b. a take-up chamber for receiving said film after exposure: c. a crosspiece interconnecting said storage and take-up chambers and having a transport surface thereon for guiding said film from the storage chamber to said take-up chamber on the side of the crosspiece nearest the objective lens when the cassette is loaded in the camera; and d. a transport slot provided in said crosspiece extending in the film transport direction; said slot passing through the crosspiece and having a length at least equal to the distance between successive transport holes in said film; whereby, when the cassette is located in the camera, said film gate presses said film against the transport surface of said crosspiece, and on transport of said film during a driving stroke of said transport mechanism the drive member extends through the slot and into a perforation.
Claim 2
Dependent Claim
208 words
In a film cassette for roll film having transport perforations formed therein; said cassette being suitable for use with cameras having a housing adapted to receive said cassette and a film gate with a film engagement surface therein and film transport mechanism having a drive member engageable with said perforations in said film and performing driving strokes, said cassette comprising: a. a storage chamber for housing said film: b. a take-up chamber for receiving said film after exposure: c. a crosspiece interconnecting said storage and take-up chambers and having a transport surface thereon for guiding said film from the storage chamber to said take-up chamber on the side of the crosspiece nearest the objective lens when the cassette is loaded in the camera; and d. a transport slot provided in said crosspiece extending in the film transport direction; said slot passing through the crosspiece and having a length at least equal to the distance between successive transport holes in said film; whereby, when the cassette is located in the camera, said film gate presses said film against the transport surface of said crosspiece, and on transport of said film during a driving stroke of said transport mechanism the drive member extends through the slot and into a perforation.
Claim 3
Dependent Claim
31 words
A film cassette according to claim 1, wherein two side surfaces perpendicular to the transport surface of the crosspiece are spaced by a distance smaller than the width of the film.
Claim 4
Dependent Claim
32 words
A film cassette according to claim 1, wherein the crosspiece is provided on a surface opposite said transport surface with at least one rib extending over the entire length of the crosspiece.
Claim 5
Dependent Claim
20 words
A film cassette according to claim 3, wherein two ribs are provided said transport slot being provided between said ribs.
References Cited (Backward Citations)
US2381033A
Cited
US3865327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |