Patent US3509643A successfully refreshed from Google Patents.
US3509643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for self-teaching
Assignee: Individual
•
Filing: 1967-02-24
•
Granted: 1970-05-05
•
Expires: 1987-02-24
Abstract
No abstract record available.
Inventors
- 👤 Patrick A Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:50
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2511202A
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US2970385A
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US2889634A
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US3100352A
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US3057082A
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US3086300A
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US3177595A
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US3300876A
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US3397466A
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US3316660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |