Patent US2644220A successfully refreshed from Google Patents.
US2644220A
Expired / Lapsed
US
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Method of producing test specimens of concrete for pressure tests
Assignee: Individual
•
Filing: 1951-11-24
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Granted: 1953-07-07
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Expires: 1971-11-24
Abstract
No abstract record available.
Inventors
- 👤 Thaulow Sven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:54
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0094; B28B1/00; B28B1/04; G; G01; G01N; G01N1/00; G01N1/02; G01N1/04; Y; Y10; Y10S; Y10S249/00; Y10S249/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1533341A
Cited
US1782412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |