Patent US3675993A successfully refreshed from Google Patents.
US3675993A
Expired / Lapsed
US
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Visual system
Assignee: Link Flight Simulation Corp
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Filing: 1971-01-18
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Granted: 1972-07-11
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Expires: 1991-01-18
Abstract
Abstract A SIMPLIFIED VISUAL SYSTEM WHICH IS INEXPENSIVE AND PROVIDES VISUAL TRAINING AIDS FOR A GENERAL-PURPOSE AVIATION TRAINER BY USING A MOTION PICTURE PROJECTOR TO PROJECT UPON A SUITABLE DISPLAY SCREEN IN CLEAR VIEW OF THE TRAINEE MOTION PICTURES OF AIRCRAFT LANDINGS AND TAKE OFFS. THE SOUND TRACK OF THE MOTION PICTURE CONTAINING INFORMATION PERTAINING TO THE SPEED OF THE CAMERA AIRCRAFT WHEN THE PIC- TURE WAS MADE IS READ AND USED TO CONTROL THE PROJECTION SPEED OF THE FILM. IN ADDITION, THE APPARATUS FOR INITIATING THE PROJECTION OF THE FILM AT THE PROPER TIME, FOR HALTING THE MOTION PICTURE AT THE PROPER TIME AND FOR REWINDING THE FILM IS PROVIDED.
Inventors
- 👤 William C Ebeling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/304; G03; G03B; G03B31/00; G03B31/02
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 |