Patent US2374628A successfully refreshed from Google Patents.
US2374628A
Expired / Lapsed
US
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Portland cement and method of retarding the setting rate thereof
Assignee: Lone Star Cement Corp
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Filing: 1940-05-14
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Granted: 1945-04-24
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Expires: 1960-05-14
Abstract
No abstract record available.
Inventors
- 👤 Myron A Swayze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:18
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C04B28/00; C04B28/02; C04B28/04; C04B2103/00; C04B2103/20; C04B2103/22
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) | 1948-04-23 | 1948-10-23 | 1949-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-04-23 | 1952-10-23 | 1953-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-04-23 | 1956-10-23 | 1957-04-24 | $7700.00 | Window Closed / Lapsed |