Patent US1907584A successfully refreshed from Google Patents.
Patent US3552841A successfully refreshed from Google Patents.
US3552841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatically controlling the running of a cinematographic projector
Assignee: Teverama SA
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Filing: 1968-03-19
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Granted: 1971-01-05
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Expires: 1988-03-19
Abstract
Abstract THE FILM-DRIVING ELECTRIC MOTOR OF A MOVIE PROJECTOR IS AUTOMATICALLY CONTROLLED BY A SWITCH WHICH SENSED A RECESS FORMED AT A PARTICULAR LOCATION OF THE FILM AS IT UNWINDS THROUGH THE PROJECTOR. THIS RECESS IS A LONGITUDINALLY ELONGATED SLOT ALIGNED WITH THE STANDARD PERFORATIONS OF THE FILM AND MUCH LONGR THAN EACH PERFORATION. THE CONTROL SWITCH OPERATES BY MEANS OF TWO SMALL, INDEPENDENTLY MOVABLE, CONTACT STUDS POSITIONED IN ALIGNMENT WITH THE PERFORATIONS AND SLOT AND SPACED FROM EACH OTHER BY A DISTANCE SLIGHTLY SMALLER THAN THE SLOT LENGTH.
Inventors
- 👤 Charles Michelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:21
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/50; G03B21/52; G03B21/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |