US2546789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational device
Assignee: Individual
•
Filing: 1948-02-24
•
Granted: 1951-03-27
•
Expires: 1968-02-24
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Schielke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:22
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/18; G; G09; G09F; G09F11/00; G09F11/24; G09F11/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190022562A
Cited
GB191401007A
Cited
US1176628A
Cited
US1650659A
Cited
US1756208A
Cited
US1806160A
Cited
US2192257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |