Patent US3376657A successfully refreshed from Google Patents.
US3376657A
Expired / Lapsed
US
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Audio-visual teaching machine
Assignee: Dorsett Industries Inc
•
Filing: 1965-06-07
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Granted: 1968-04-09
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Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 Loyd G Dorsett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:37
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2279119A
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US2526516A
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US2787669A
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US2843012A
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US2985069A
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US3141244A
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US3191315A
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US3181421A
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US3266172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |