Patent US3675994A successfully refreshed from Google Patents.
US3675994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filmstrip projector with synchronized sound
Assignee: Bell and Howell Co
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Filing: 1970-12-14
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Granted: 1972-07-11
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Expires: 1990-12-14
Abstract
Abstract A FILMSTRIP PROJECTOR PROVIDED WITH SYNCHRONIZED AUDIO ACCOMPANIMENT. THE FILMSTRIP IS FRAMED TO A PROJECTION APERTURE BY A MANUALLY OPERABLE FRAMING MEANS. ONCE FRAMED, THE FILMSTRIP IS ADVANCED FRAME-BYFRAME BY A MOTOR DRIVEN FILM ADVANCE MECHANISM. THE AUDIO ACCOMPANIMENT IS CARRIED ON A DUAL TRACK AUDIO TAPE ONE TRACK OF WHICH CARRIES THE AUDIO ACCOMPANIMENT. THE REMAINING TRACK CARRIES CONTROL SIGNALS WHICH SERVE TO ACTUATE THE FILM ADVANCE MECHANISM TO MAINTAIN SYNCHONIZATION BETWEEN THE AUDIO TRACK AND FILMSTRIP. THE FRAMING DEVICE INCLUDES A CLUTCH FOR DISENGAGING THE FILM DRIVE MECHANISM FROM THE DRIVE MOTOR.
Inventors
- 👤 Frank C Badalich
- 👤 Roy H Watterlohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:00
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43; G03B23/00; G03B23/08; G03B23/12; G03B31/00; G03B31/06; G03B35/00; G03B35/18; G03B35/24
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |