Patent US2823440A successfully refreshed from Google Patents.
US2823440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel slab concrete mold
Assignee: H EDWIN SCHADE CO
•
Filing: 1954-02-23
•
Granted: 1958-02-18
•
Expires: 1974-02-23
Abstract
No abstract record available.
Inventors
- 👤 Henry E Schade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:50
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0029
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US938718A
Cited
US1330735A
Cited
US1465350A
Cited
US1530489A
Cited
US1914033A
Cited
US2429892A
Cited
US2513882A
Cited
US2671941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |