US2961779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational manipulative device and method of teaching
Assignee: Individual
•
Filing: 1959-07-30
•
Granted: 1960-11-29
•
Expires: 1979-07-30
Abstract
No abstract record available.
Inventors
- 👤 Mary I Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:48
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/04; A63H33/06; A63H33/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US705833A
Cited
US1043652A
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US2119921A
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US2446120A
Cited
US2506001A
Cited
US2540369A
Cited
US2649803A
Cited
US2714269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |