Patent US2540432A successfully refreshed from Google Patents.
US2540432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational plastic set
Assignee: Individual
•
Filing: 1946-03-15
•
Granted: 1951-02-06
•
Expires: 1966-03-15
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/32; Y; Y10; Y10S; Y10S425/00; Y10S425/057
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US260368A
Cited
US340555A
Cited
US1165937A
Cited
US1218441A
Cited
US1381854A
Cited
US1414507A
Cited
US1576989A
Cited
US2054476A
Cited
US2406455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |