US2597901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water repellent gypsum product and process of making same
Assignee: Individual
•
Filing: 1950-08-31
•
Granted: 1952-05-27
•
Expires: 1970-08-31
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Riddell
- 👤 George B Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:03
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/20; C04B2111/27; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/31504; Y10T428/31971
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
WATER-REPELLENT GYPSUM WALLBOARD COMPRISING A GYPSUM CORE DISPOSED WITHIN FIBROUS LINERS WHEREIN SAID CORE COMPRISES A SET MASS OF GYPSUM CRYSTALS PROTECTIVELY COATED WITH UNIFORMLY DISPERSED PRECIPITATED CALCIUM ROSIN SOAP AND RESIDUAL FUEL OIL, SAID ROSIN SOAP BEING PRESENT IN AN AMOUNT OF FROM 1.0% TO 2.0% BY WEIGHT AND SAID OIL BEING PRESENT IN AN AMOUNT OF FROM 5% TO 10% BY WEIGHT CALCULATED ON THE DRY BASIS.
Claim 2
Dependent Claim
69 words
WATER-REPELLENT GYPSUM WALLBOARD COMPRISING A GYPSUM CORE DISPOSED WITHIN FIBROUS LINERS WHEREIN SAID CORE COMPRISES A SET MASS OF GYPSUM CRYSTALS PROTECTIVELY COATED WITH UNIFORMLY DISPERSED PRECIPITATED CALCIUM ROSIN SOAP AND RESIDUAL FUEL OIL, SAID ROSIN SOAP BEING PRESENT IN AN AMOUNT OF FROM 1.0% TO 2.0% BY WEIGHT AND SAID OIL BEING PRESENT IN AN AMOUNT OF FROM 5% TO 10% BY WEIGHT CALCULATED ON THE DRY BASIS.
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) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |