Patent US3605285A successfully refreshed from Google Patents.
US3605285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Random access audio-visual educational apparatus
Assignee: RCA Licensing Corp
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Filing: 1969-05-26
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Granted: 1971-09-20
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Expires: 1989-05-26
Abstract
Abstract A SYSTEM FOR PROVIDING AN AUDIO EXPLANATION AS A SUPPLEMENT FOR ANY DESIRED INFORMATION PRINTED ON A SHEET OF PAPER COMPRISES AN ARRAY OF FLEXIBLE CONTACTS OVER WHICH THE SHEET IS POSITIONED. BY DEPRESSING THE SHEET AT THE LOCATION OF THE INFORMATION FOR WHICH ADDITIONAL EXPLANATION IS DESIRED, A PHONOGRAPH PICKUP IS MOVED INTO A PREDETERMINED ONE OF A PLURALITY OF GROOVES RECORDED IN THE FORM OF NESTED SPIRALS ON A PHONOGRAPH DISK IN ORDER TO REPRODUCE AUDIBLY THE CORRESPONDING INFORMATION RECORDED THEREON.
Inventors
- 👤 David J Bendaniel
- 👤 James B Comly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:56
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/06; G09B5/062
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |