US2801855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mathematics game apparatus
Assignee: Individual
•
Filing: 1953-09-17
•
Granted: 1957-08-06
•
Expires: 1973-09-17
Abstract
No abstract record available.
Inventors
- 👤 Elmer D Clay
- 👤 Agnes D Clay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:02
CPC Classifications
A; A63; A63F; A63F3/00; A63F3/04; A63F3/0457; G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2355785A
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US2565702A
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US2562633A
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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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |