Patent US3285087A successfully refreshed from Google Patents.
US3285087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed drive sprocket
Assignee: Panopix Research Inc
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Filing: 1963-07-24
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Granted: 1966-11-15
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Expires: 1983-07-24
Abstract
No abstract record available.
Inventors
- 👤 Leon W Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:28
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/42; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19228; Y10T74/19242
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A FILM DRIVING SPROCKET FOR A MOTION PICTURE PROJECTOR, COMPRISING: A FIXED BASE MEMBER HAVING AN OUTER CYLINDRICAL SURFACE AND A CONCENTRIC BORE; A HOLLOW CYLINDRICAL DRUM JOURNALLED AT ONE END ON THE OUTER CYLINDRICAL SURFACE OF SAID BASE MEMBER AND HAVING FILM DRIVING SPROCKET TEETH ON ITS OUTER PERIPHERY; A DRIVING SHAFT EXTENDING THROUGH THE BORE OF SAID BASE MEMBER; AT LEAST ONE DRIVE MEMBER DISPOSED CONCENTRICALLY BETWEEN SAID DRUM AND SAID DRIVING SHAFT AND ROTATABLE WITH RESPECT TO BOTH SAID DRUM AND SAID DRIVING SHAFT; GEARING IN SAID DRUM INTERCONNECTING SAID BASE MEMBER, DRIVING SHAFT AND DRIVE MEMBER WHEREBY, WHEN SAID DRIVING SHAFT ROTATES RELATIVE TO SAID BASE MEMBER, SAID DRIVE MEMBER IS ROTATED AT A SPEED DIFFERENT FROM THAT OF SAID DRIVING SHAFT; AND CLUTCH MEANS CARRIED BY SAID DRUM AND ACCESSIBLE FROM THE END OF SAID DRUM OPPOSITE FROM SAID BASE MEMBER FOR SELECTIVELY CLUTCHING SAID DRUM TO SAID DRIVE MEMBER OR TO SAID DRIVING SHAFT.
Claim 2
Dependent Claim
160 words
A FILM DRIVING SPROCKET FOR A MOTION PICTURE PROJECTOR, COMPRISING: A FIXED BASE MEMBER HAVING AN OUTER CYLINDRICAL SURFACE AND A CONCENTRIC BORE; A HOLLOW CYLINDRICAL DRUM JOURNALLED AT ONE END ON THE OUTER CYLINDRICAL SURFACE OF SAID BASE MEMBER AND HAVING FILM DRIVING SPROCKET TEETH ON ITS OUTER PERIPHERY; A DRIVING SHAFT EXTENDING THROUGH THE BORE OF SAID BASE MEMBER; AT LEAST ONE DRIVE MEMBER DISPOSED CONCENTRICALLY BETWEEN SAID DRUM AND SAID DRIVING SHAFT AND ROTATABLE WITH RESPECT TO BOTH SAID DRUM AND SAID DRIVING SHAFT; GEARING IN SAID DRUM INTERCONNECTING SAID BASE MEMBER, DRIVING SHAFT AND DRIVE MEMBER WHEREBY, WHEN SAID DRIVING SHAFT ROTATES RELATIVE TO SAID BASE MEMBER, SAID DRIVE MEMBER IS ROTATED AT A SPEED DIFFERENT FROM THAT OF SAID DRIVING SHAFT; AND CLUTCH MEANS CARRIED BY SAID DRUM AND ACCESSIBLE FROM THE END OF SAID DRUM OPPOSITE FROM SAID BASE MEMBER FOR SELECTIVELY CLUTCHING SAID DRUM TO SAID DRIVE MEMBER OR TO SAID DRIVING SHAFT.
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |