US3057742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall plasters and their preparation
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1959-09-11
•
Granted: 1962-10-09
•
Expires: 1979-09-11
Abstract
No abstract record available.
Inventors
- 👤 Cunningham Kenneth Gerrard
- 👤 Baillie Andrew Jamieson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:18
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C04B28/00; C04B28/14; C04B2103/00; C04B2103/20; C04B2103/22; C04B2111/00; C04B2111/00474; C04B2111/00482
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A DRY PLASTER MIXTURE CONSISTING ESSENTIALLY OF DRY HYDRATED LIME, SET RETARDED CALCIUM SULPHATE HEMIHYDRATE AND FROM ABOUT 0.2 TO 1% BASED ON TEH WEIGHT OF THE SOLIDS OF A CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF METHYL CELLULOSE, HYDROXY ETHYL CELLULOSE AND METHYL HYDROXY ETHYL CELLULOSE HAVING A VISCOSITY OF NOT LESS THAN ABOUT 500 CENTIPOISES IN 2% AQUEOUS SOLUTION AT 15*C. AND BEING SUFFICIENTLY FINE TO PASS A 100 MESH B.S. SCREEN, THE RATIO BY WEIGHT OF CALCIUM SULPAHATE HEMIHYDRATE TO CALCIUM HYDROXIDE BEING FROM 4:1 TO 1:4.
Claim 2
Dependent Claim
91 words
A DRY PLASTER MIXTURE CONSISTING ESSENTIALLY OF DRY HYDRATED LIME, SET RETARDED CALCIUM SULPHATE HEMIHYDRATE AND FROM ABOUT 0.2 TO 1% BASED ON TEH WEIGHT OF THE SOLIDS OF A CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF METHYL CELLULOSE, HYDROXY ETHYL CELLULOSE AND METHYL HYDROXY ETHYL CELLULOSE HAVING A VISCOSITY OF NOT LESS THAN ABOUT 500 CENTIPOISES IN 2% AQUEOUS SOLUTION AT 15*C. AND BEING SUFFICIENTLY FINE TO PASS A 100 MESH B.S. SCREEN, THE RATIO BY WEIGHT OF CALCIUM SULPAHATE HEMIHYDRATE TO CALCIUM HYDROXIDE BEING FROM 4:1 TO 1:4.
References Cited (Backward Citations)
US1127514A
Cited
US2013811A
Cited
US2465045A
Cited
US2583657A
Cited
US2599445A
Cited
US2700615A
Cited
US2909223A
Cited
US2950206A
Cited
US2980548A
Cited
US2902378A
Cited
GB815184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |