US3352468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide film anvance mechanisms
Assignee: Individual
•
Filing: 1965-05-24
•
Granted: 1967-11-14
•
Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 Robert L Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:25
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/08; G03B23/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
AN APPARATUS FOR PERIODICALLY ADVANCING A SLIDE FILM IN A PROJECTOR THE DISTANCE OF ONE SLIDE, COMPRISING A UNIT ADAPTED TO BUILD UP A STORAGE OF POWER DURING THE INTERVALS BETWEEN FILM ADVANCES AND OPERABLE TO ADVANCE THE FILM, A CONTROL FOR CHECKING THE OPERATION OF THE UNIT DURING SAID INTERVALS AND RELEASING THE UNIT FOR OPERATON WHEN THE FILM IS TO BE ADVANCED, AND MEANS LIMITING THE ADVANCE TO SAID DISTANCE, SAID UNIT BEING A MOTOR OPERATING THROUGH A WORM PINION AND A GEAR TO WIND A SPRING, AND THE MOTOR ADVANCING WITH THE PINION WHEN THE SPRING BECOMES WOUND AND THE GEAR PRESENTS STRONG RESISTANCE AS A RESULT, AND SWITCH MEAND DISCONNECTING THE MOTOR ON ITS ADVANCE.
Claim 2
Independent Claim
119 words
AN APPARATUS FOR PERIODICALLY ADVANCING A SLIDE FILM IN A PROJECTOR THE DISTANCE OF ONE SLIDE, COMPRISING A UNIT ADAPTED TO BUILD UP A STORAGE OF POWER DURING THE INTERVALS BETWEEN FILM ADVANCES AND OPERABLE TO ADVANCE THE FILM, A CONTROL FOR CHECKING THE OPERATION OF THE UNIT DURING SAID INTERVALS AND RELEASING THE UNIT FOR OPERATON WHEN THE FILM IS TO BE ADVANCED, AND MEANS LIMITING THE ADVANCE TO SAID DISTANCE, SAID UNIT BEING A MOTOR OPERATING THROUGH A WORM PINION AND A GEAR TO WIND A SPRING, AND THE MOTOR ADVANCING WITH THE PINION WHEN THE SPRING BECOMES WOUND AND THE GEAR PRESENTS STRONG RESISTANCE AS A RESULT, AND SWITCH MEAND DISCONNECTING THE MOTOR ON ITS ADVANCE.
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) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |