Patent US4234907A successfully refreshed from Google Patents.
US2296352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete form
Assignee: Individual
•
Filing: 1941-05-23
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Granted: 1942-09-22
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Expires: 1961-05-23
Abstract
No abstract record available.
Inventors
- 👤 Theodore F Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:21
CPC Classifications
E; E02; E02D; E02D5/00; E02D5/66; E02D5/665
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-09-21 | 1946-03-23 | 1946-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-09-21 | 1950-03-23 | 1950-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-09-21 | 1954-03-23 | 1954-09-22 | $7700.00 | Window Closed / Lapsed |