US2856304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementitious compositions and method of making the same
Assignee: Kaiser Gypsum Co Inc
•
Filing: 1953-12-28
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Granted: 1958-10-14
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Expires: 1973-12-28
Abstract
No abstract record available.
Inventors
- 👤 George B Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:44
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B24/00; C04B24/16; C04B24/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A GYPSUM PRODUCT OF INCREASED COMPRESSIVE STRENGTH CONSISTING ESSENTIALLY OF A SET MASS OF GYPSUM CRYSTALS HAVING UNIFORMLY DISPERSED THERETHROUGH FROM 0.05% TO 1.0% ON THE DRY BASIS OF AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF WASTE SULFITE LIQUOR, LIGNONE SULFONATE, LIGNIN MATERIAL ACID-PRECIPITATED FROM BLACK LIQUOR AND THE WATER-SOLUBLE SOAP OF SAID ACID-PRECIPITATED BLACK LIQUOR LIGNIN, AND ALKALI LIGNIN.
References Cited (Backward Citations)
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DE615778C
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US2141570A
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US2360519A
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US2662024A
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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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |