US3608208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teaching machine
Assignee: Individual
•
Filing: 1969-06-18
•
Granted: 1971-09-28
•
Expires: 1989-06-18
Abstract
Abstract A TEACHING MACHINE HAVING IMPROVED MEANS TO MOVE A FILM FROM A FIRST VIEWING POSITION TO ONE OF A PLURALITY OF POSSIBLE SECOND VIEWING POSITIONS WHEREIN THE MEANS TO MOVE THE FILM INCLUDES MEANS, DEPENDENT ON AN OPERATOR''S RESPONSE WHILE IN THE FIRST VIEWING POSITION, TO STOP THE FILM IN A SECOND VIEWING POSITION CORRESPONDING TO SAID RESPONSE.
Inventors
- 👤 Fred W Willardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:55
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/08
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |