Special synchronizer
Abstract
Abstract APPARATUS FOR SYNCHRONIZING A PAIR OF SLIDE PROJECTORS OR OTHER APPARATUS SO THAT THERE IS NO DELAY SUCH AS OCCURS WITH A SINGLE SLIDE PROJECTOR BETWEEN PICTURES. BOTH PROJECTORS ARE ALTERNATELY LOADED WITH OPAQUE SLIDES, AND WHILE ONE OF THE PROJECTORS IS PROJECTING AN IMAGE ON THE SCREEN, THE OTHER PROJECTOR HAS AN OPAQUE SLIDE IN ITS LENS SYSTEM. WHEN THE ADVANCE BUTTON IS DEPRESSED, THE PROJECTOR WITH THE OPAQUE SLIDE IS STARTED INTO ITS ADVANCE CYCLE AND AS IT NEARS THE END OF ITS CYCLE, THE SECOND PROJECTOR, WHICH HAS BEEN SHOWING THE PICTURE, IS STARTED INTO ITS ADVANCE CYCLE. THESE TWO OPERATIONS ARE TIMES SO THAT THE PICTURE FROM THE SECOND PROJECTOR IS REMOVED FROM THE SCREEN AT THE SAME TIME AS THE PICTURE FROM THE FIRST PROJECTOR IS PROJECTED ONTO THE SCREEN. THE OPERATION IS REPEATED WITH ALTERNATE PROJECTORS PROJECTING SLIDES ONTO THE SCREEN.
Inventors
- 👤 Cecil A Broom
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |