US2604411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementitious composition
Assignee: Individual
•
Filing: 1950-07-10
•
Granted: 1952-07-22
•
Expires: 1970-07-10
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Riddell
- 👤 George B Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:48
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/20; C04B2111/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN A PROCESS FOR PRODUCING A WATER REPELLANT GYPSUM PRODUCT THE STEP WHICH COMPRISES INTIMATELY ADMIXING A WATER SLURRY OF CALCINED GYPSUM, FROM 0.5% TO 2.0%, BASED ON THE DRY WEIGHT, OF PETROLEUM WAX IN THE FORM OF WATER EMULSION, AND FROM 2% TO 10%, BASED ON THE DRY WEIGHT, OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF RESIDUAL FUEL OIL, PINE TAR AND COAL TAR.
Claim 2
Dependent Claim
69 words
IN A PROCESS FOR PRODUCING A WATER REPELLANT GYPSUM PRODUCT THE STEP WHICH COMPRISES INTIMATELY ADMIXING A WATER SLURRY OF CALCINED GYPSUM, FROM 0.5% TO 2.0%, BASED ON THE DRY WEIGHT, OF PETROLEUM WAX IN THE FORM OF WATER EMULSION, AND FROM 2% TO 10%, BASED ON THE DRY WEIGHT, OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF RESIDUAL FUEL OIL, PINE TAR AND COAL TAR.
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) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |