US3563777A
Expired / Lapsed
US
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Plaster composition having increased air entrainment
Assignee: Sinclair Research Inc
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Filing: 1968-04-18
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Granted: 1971-02-16
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Expires: 1988-04-18
Abstract
Abstract A PLASTER COMPOSITION IS PREPARED HAVING SUPERIOR AIR ENTRAINING PROPERTIES AND REDUCED BULK DENSITY SUBSEQUENT TO SETTING, COMPRISING A SETTABLE GYPSUM PLASTER AND A MINOR AMOUNT OF A WATER-SOLUBLE SALT OF THE ESTER FORMED BY REACTING STYRENE-MALEIC ANHUDRIDE COPOLYMER WITH A MONOHYDRIC ALCOHOL OF ABOUT 1 TO 12 CARBON ATOMS. AMOUNTS OF ABOUT 0.05 TO 5 WEIGHT PERCENT OF THE ESTER SALT, BASED ON THE WEIGHT OF THE PLASTER, HAVE BEEN FOUND TO BE EFFECTIVE IN INCREASING AIR ENTRAINMENT AND THEREBY LOWERING BULK DENSITY IN THE PLASTER COMPOSITION.
Inventors
- 👤 Richard J Pratt
- 👤 Michael A Stram
- 👤 David W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:39
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2664; C04B2103/00; C04B2103/30; C04B2103/304
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |