US2731377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementitious composition and process of producing the same
Assignee: Kaiser Gypsum Co Inc
•
Filing: 1951-08-13
•
Granted: 1956-01-17
•
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 16:56
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.
References Cited (Backward Citations)
US2172076A
Cited
US1936887A
Cited
US2225150A
Cited
US2288736A
Cited
US2382561A
Cited
US2354156A
Cited
US2355966A
Cited
US2451446A
Cited
US2478831A
Cited
US2542364A
Cited
US2463927A
Cited
US2483806A
Cited
US2529835A
Cited
US2521073A
Cited
US2593008A
Cited
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 |