Patent US2731377A successfully refreshed from Google Patents.
US2731377A
Expired / Lapsed
US
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Cementitious composition and process of producing the same
Assignee: Kaiser Gypsum Co Inc
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Filing: 1951-08-13
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Granted: 1956-01-17
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Expires: 1971-08-13
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Riddell
- 👤 George B Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:36
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249968; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
PROCESS FOR MAKING A LOW-DENSITY CELLULAR GYPSUM WALLBOARD WHICH COMPRISES PREPARING A WATER SLURRY CONTAINING CALCINED GYPSUM AND FROM 0.05% TO 1.0%, BASED ON THE TOTAL DRY WEIGHT, OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF THE PETROLEUM HYDROCARBON-INSOLUBLE FRACTION OF THE COAL-TAR EXTRACT OF PINE WOOD AND A WATER-SOLUBLE SALT OF SAID FRACTION, THOROUGHLY MIXING SAID SLURRY MIXTURE TO FORM FINE TEXTURED FOAM THEREIN, DEPOSITING SAID FOAM-CONTAINING SLURRY BETWEEN FIBROUS LINERS, DRYING AND HARDENING.
Claim 2
Dependent Claim
78 words
PROCESS FOR MAKING A LOW-DENSITY CELLULAR GYPSUM WALLBOARD WHICH COMPRISES PREPARING A WATER SLURRY CONTAINING CALCINED GYPSUM AND FROM 0.05% TO 1.0%, BASED ON THE TOTAL DRY WEIGHT, OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF THE PETROLEUM HYDROCARBON-INSOLUBLE FRACTION OF THE COAL-TAR EXTRACT OF PINE WOOD AND A WATER-SOLUBLE SALT OF SAID FRACTION, THOROUGHLY MIXING SAID SLURRY MIXTURE TO FORM FINE TEXTURED FOAM THEREIN, DEPOSITING SAID FOAM-CONTAINING SLURRY BETWEEN FIBROUS LINERS, DRYING AND HARDENING.
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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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |