US2957775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum composition
Assignee: United States Gypsum Co
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Filing: 1957-06-27
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Granted: 1960-10-25
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Expires: 1977-06-27
Abstract
No abstract record available.
Inventors
- 👤 Robert E Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:38
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2664; C04B24/34; C04B28/00; C04B28/14; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A GYPSUM COMPOSITION CONSISTING ESSENTIALLY OF SET GYPSUM CRYSTALS CONTAINING AN ACIDIC SALT PRECIPITANT AND A MINOR AMOUNT OF THE REACTION PRODUCT OF MALEIC ANHYDRIDE AND ROSIN WHEREIN THE MALEIC ANHYDRIDE IS INITIALLY PRESENT IN AN AMOUNT OF AT LEAST TWO PARTS PER 100 PARTS OF ROSIN AND WHEREIN SAID REACTION PRODUCT HAS AN ACID NUMBER OF GREATER THAN 165.
Claim 2
Dependent Claim
60 words
A GYPSUM COMPOSITION CONSISTING ESSENTIALLY OF SET GYPSUM CRYSTALS CONTAINING AN ACIDIC SALT PRECIPITANT AND A MINOR AMOUNT OF THE REACTION PRODUCT OF MALEIC ANHYDRIDE AND ROSIN WHEREIN THE MALEIC ANHYDRIDE IS INITIALLY PRESENT IN AN AMOUNT OF AT LEAST TWO PARTS PER 100 PARTS OF ROSIN AND WHEREIN SAID REACTION PRODUCT HAS AN ACID NUMBER OF GREATER THAN 165.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |