Patent US2909223A successfully refreshed from Google Patents.
US2909223A
Expired / Lapsed
US
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Gypsum cements
Assignee: Phillips Petroleum Co
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Filing: 1952-05-05
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Granted: 1959-10-20
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Expires: 1972-05-05
Abstract
No abstract record available.
Inventors
- 👤 Kaveler Herman Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:28
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C09K8/467; C09K8/487; C04B2103/00; C04B2103/20; C04B2103/22; C04B2103/46; C04B2111/00; C04B2111/00474; C04B2111/00663
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A CEMENT CAPABLE OF FORMING A FLUID SLURRY WHEN MIXED WITH WATER, SAID CEMENT CONSISTING ESSENTIALLY OF GYPSUM CEMENT CONTAINING MORE THAN 66% CALCINED GYPSUM BY WEIGHT MIXED WITH A MINOR PROPORTION OF ALKALI METAL CARBOXYMETHYL HYDROXYETHYL CELLULOSE MIXED ETHER.
Claim 2
Dependent Claim
40 words
A CEMENT CAPABLE OF FORMING A FLUID SLURRY WHEN MIXED WITH WATER, SAID CEMENT CONSISTING ESSENTIALLY OF GYPSUM CEMENT CONTAINING MORE THAN 66% CALCINED GYPSUM BY WEIGHT MIXED WITH A MINOR PROPORTION OF ALKALI METAL CARBOXYMETHYL HYDROXYETHYL CELLULOSE MIXED ETHER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |