US2970388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Education device
Assignee: Individual
•
Filing: 1956-05-07
•
Granted: 1961-02-07
•
Expires: 1976-05-07
Abstract
No abstract record available.
Inventors
- 👤 Edward H Yonkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:47
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/04; A63H33/046; G; G09; G09B; G09B23/00; G09B23/26; Y; Y10; Y10S; Y10S52/00; Y10S52/10; Y10T; Y10T403/00; Y10T403/34; Y10T403/341; Y10T403/342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB428082A
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GB597762A
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US2499241A
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US2570625A
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US2648157A
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US2598831A
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US2665913A
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US2716292A
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US2739697A
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US2846809A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |