US2248032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cements from calcium sulphate and blast furnace slag
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1939-02-23
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Granted: 1941-07-01
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Expires: 1959-02-23
Abstract
No abstract record available.
Inventors
- 👤 Dunn John Stanley
- 👤 Lefebure Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:38
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/14; C04B7/147; C04B7/153; C04B7/21; C04B22/00; C04B22/0093; Y; Y02; Y02P; Y02P40/00; Y02P40/10
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) | 1944-06-30 | 1944-12-30 | 1945-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-06-30 | 1948-12-30 | 1949-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-06-30 | 1952-12-30 | 1953-07-01 | $7700.00 | Window Closed / Lapsed |