Patent US2962458A successfully refreshed from Google Patents.
US2962458A
Expired / Lapsed
US
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Plaster composition comprising plaster of paris and polyacrylamide
Assignee: Individual
•
Filing: 1957-12-27
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Granted: 1960-11-29
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Expires: 1977-12-27
Abstract
No abstract record available.
Inventors
- 👤 Bird Henry William
- 👤 Stephens Roderick Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:34
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C08; C08K; C08K3/00; C08K3/30; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PLASTER COMPOSITION CONSISTING OF AT LEAST 50% BY WEIGHT OF PLASTER OF PARIS, FROM 0.2 TO 2% BY WEIGHT OF POLYACRYLAMIDE, FROM 1 TO 5% BY WEIGHT OF ANIMAL GLUE, UP TO 1% BY WEIGHT OF AN ALKALI SALT OF AT LEAST ONE SULPHATED FATTY ALCOHOL AS A WETTING AGENT, UP TO 10% BY WEIGHT OF A CHEMICALLY INERT WATER-INSOLUBLE FILLER SELECTED FROM THE GROUP CONSISTING OF WOOD CELLULOSE, FINELY DIVIDIED MICA AND SHORT FIBRE ASBESTOS, AND UP TO 4% BY WEIGHT OF GYPSUM, ALL PERCENTAGES BEING BASED ON THE WEIGHT OF THE COMPOSITION.
Claim 2
Dependent Claim
95 words
A PLASTER COMPOSITION CONSISTING OF AT LEAST 50% BY WEIGHT OF PLASTER OF PARIS, FROM 0.2 TO 2% BY WEIGHT OF POLYACRYLAMIDE, FROM 1 TO 5% BY WEIGHT OF ANIMAL GLUE, UP TO 1% BY WEIGHT OF AN ALKALI SALT OF AT LEAST ONE SULPHATED FATTY ALCOHOL AS A WETTING AGENT, UP TO 10% BY WEIGHT OF A CHEMICALLY INERT WATER-INSOLUBLE FILLER SELECTED FROM THE GROUP CONSISTING OF WOOD CELLULOSE, FINELY DIVIDIED MICA AND SHORT FIBRE ASBESTOS, AND UP TO 4% BY WEIGHT OF GYPSUM, ALL PERCENTAGES BEING BASED ON THE WEIGHT OF THE COMPOSITION.
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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |