US3305518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plaster composition containing polyvinyl acetate
Assignee: United States Gypsum Co
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Filing: 1963-07-09
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Granted: 1967-02-21
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Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Jakacki
- 👤 Archie L Hampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:23
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
GYPSUM PLASTER COMPRISING ABOUT 700 TO 950 PARTS BY WEIGHT OF CALCIUM SULFATE HEMIHYDRATE, ABOUT 2 TO 50 PARTS BY WEIGHT OF POWDERED WATER-DISPERSIBLE POLYVINYL ACETATE, AND ABOUT 50 TO 300 PARTS BY WEIGHT OF FINELY DIVIDED DEAD BURNED CALCIUM SULFATE HAVING A BLAINE SURFACE AREA VALUE OF AT LEAST ABOUT 10,000 SQUARE CENTIMETERS PER GRAM.
Claim 2
Dependent Claim
56 words
GYPSUM PLASTER COMPRISING ABOUT 700 TO 950 PARTS BY WEIGHT OF CALCIUM SULFATE HEMIHYDRATE, ABOUT 2 TO 50 PARTS BY WEIGHT OF POWDERED WATER-DISPERSIBLE POLYVINYL ACETATE, AND ABOUT 50 TO 300 PARTS BY WEIGHT OF FINELY DIVIDED DEAD BURNED CALCIUM SULFATE HAVING A BLAINE SURFACE AREA VALUE OF AT LEAST ABOUT 10,000 SQUARE CENTIMETERS PER GRAM.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |