Patent US2451445A successfully refreshed from Google Patents.
US2451445A
Expired / Lapsed
US
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Manufacture of dense products from cement material
Assignee: United States Gypsum Co
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Filing: 1943-09-06
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Granted: 1948-10-12
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Expires: 1963-09-06
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:19
CPC Classifications
C; C04; C04B; C04B40/00; C04B2103/00; C04B2103/30; C04B2111/00; C04B2111/00034; C04B2111/00068; C04B2111/00241; C04B2111/00301
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2053842A
Cited
US1806250A
Cited
GB487259A
Cited
US2283192A
Cited
US2292012A
Cited
US2337915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |