US2902775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational device
Assignee: Individual
•
Filing: 1955-03-14
•
Granted: 1959-09-08
•
Expires: 1975-03-14
Abstract
No abstract record available.
Inventors
- 👤 Robert K Arrowsmith
- 👤 Jessie M Arrowsmith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:06
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/0098; G; G09; G09B; G09B3/00; G09B3/06; G09B3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1656030A
Cited
US2075529A
Cited
US2201479A
Cited
US1076257A
Cited
US1445819A
Cited
US2234075A
Cited
US2676019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |