Audio-visual display device
Abstract
Abstract A PORTABLE AUDIO-VISUAL DISPLAY DEVICE CHARACTERIZED BY A COMPACT FILM CARTRIDGE EMPLOYING CONVENTIONAL 35 MM. STILL CAMERA FILM STRIP, THE FRAMES BEING SEQUENTIALLY POWER ADVANCED BY A SIGNAL RECEIVED FROM AN AUDIO UNIT AND THE TAKE-UP SPOOL ALSO BEING SYNCHRONOUSLY POWER DRIVEN IN SUCH MANNER TO COMPENSATE FOR THE INCREASE IN DIMETER OF THE FILM CONVOLUTIONS ON THE TAKE-UP SPOOL. MANUAL OVERRIDE OF THE POWER DRIVE IS PROVIDED FOR FRAMING WITH A FILM GATE OR MANUAL ADVANCE OF THE FRAMES. POWER OPERATED FILM ADVACE FEATURES AN ESCAPEMENT DRIVE WHICH IS INITIATED BY A SHORT DURATION SIGNAL RECEIVED FROM THE AUDIO UNIT AND A HOLDING CIRCUIT WHICH MAINTAINS IT IN OPERATION UNTIL THE FILM HAS BEEN ADVANCED ONE FRAME.
Inventors
- 👤 W Grupp
Bibliographic Details
Claims Analysis
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |