US3879909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for accelerating cure and enhancing ultimate strength of prefabricated masonry structures
Assignee: Dow Chemical Co
•
Filing: 1974-06-12
•
Granted: 1975-04-29
•
Expires: 1994-06-12
Abstract
Abstract A process for accelerating the cure and enhancing the ultimate strength of prefabricated masonry structures prepared using latex modified portland cement mortar comprising (1) utilizing a portland cement mortar containing modifying amounts of a vinylidene chloride polymer latex and (2) substantially uniformly heating the non-cured prefabricated masonry structure to temperatures of from about 110* to about 210*F under less than about 80 percent relative humidity for a period of at least about 4 hours.
Inventors
- 👤 Lz F Lamoria
- 👤 Dallas G Grenley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:20
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2682; C04B40/00; C04B40/02; C04B40/0263
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A PROCESS FOR ACCELERATING THE CURE AND ENHANCING THE ULTIMATE STRENGTH OF PREFABRICATED MASONRY STRUCTURES WHEREIN SUCH PROCESS COMPRISES (1) UTILIZING AS THE MORTAR IN SUCH STRUCTURES A PORTLAND CEMENT MORTAR CONTAINING A VINYLIDENE CHLORIDE POLYMER LATEX IN AN AMOUNT SUFFICIENT TO PROVIDE FROM ABOUT 5 TO ABOUT 20 PERCENT BY WEIGHT OF POLYMER SOLIDS BASED ON THE WEIGHT OF MORTAR AND (2) SUBSTANTIALLY UNIFORMLY HEATING THE NON-CURED PREFABRICATED MASONRY STRUCTURE TO TEMPERACTURES OF FROM ABOTU 110* TO ABOUT 210*F UNDER LESS THAN ABOUT 80 PERCENT RELATIVE HUMIDITY FOR A PERIOD OF AT LEAST ABOUT 2 HOURS.
Claim 2
Dependent Claim
97 words
A PROCESS FOR ACCELERATING THE CURE AND ENHANCING THE ULTIMATE STRENGTH OF PREFABRICATED MASONRY STRUCTURES WHEREIN SUCH PROCESS COMPRISES (1) UTILIZING AS THE MORTAR IN SUCH STRUCTURES A PORTLAND CEMENT MORTAR CONTAINING A VINYLIDENE CHLORIDE POLYMER LATEX IN AN AMOUNT SUFFICIENT TO PROVIDE FROM ABOUT 5 TO ABOUT 20 PERCENT BY WEIGHT OF POLYMER SOLIDS BASED ON THE WEIGHT OF MORTAR AND (2) SUBSTANTIALLY UNIFORMLY HEATING THE NON-CURED PREFABRICATED MASONRY STRUCTURE TO TEMPERACTURES OF FROM ABOTU 110* TO ABOUT 210*F UNDER LESS THAN ABOUT 80 PERCENT RELATIVE HUMIDITY FOR A PERIOD OF AT LEAST ABOUT 2 HOURS.
Claim 3
Dependent Claim
45 words
The process of claim 1 wherein said vinylidene chloride polymer is composed of from about 35 to about 90 parts by weight of vinylidene chloride and from about 65 to 10 parts by weight of at least one other interpolymerizable material of the general formula:
Claim 4
Dependent Claim
46 words
The process of claim 2 wherein said vinylidene chloride polymer is composed of about 75 parts by weight of vinylidene chloride, about 5 parts by weight of ethyl acrylate, about 2 parts by weight of methyl methacrylate and about 20 parts by weight of vinyl chloride.
Claim 5
Dependent Claim
13 words
A substantially crack-free prefabricated masonry structure prepared by the process of claim 1.
References Cited (Backward Citations)
US3297613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |