Patent US3497966A successfully refreshed from Google Patents.
US3497966A
Expired / Lapsed
US
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Teaching machine
Assignee: PALISADES EDUCATIONAL FOUNDATION Inc
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Filing: 1967-02-20
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Granted: 1970-03-03
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Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Gaven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:55
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123920A
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US3126646A
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US3137948A
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US3141243A
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US3344534A
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US3383781A
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US3273260A
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US3382588A
Cited
US3363330A
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US3395464A
Cited
US3401470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |