US3305375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plaster composition
Assignee: United States Gypsum Co
•
Filing: 1963-07-09
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Granted: 1967-02-21
•
Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Jakacki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:32
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/002; C04B11/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A GYPSUM PLASTER COMPOSITION COMPRISING A MAJOR AMOUNT OF CALCIUM SULFATE HEMIHYDRATE AND A MINOR AMOUNT SUFFICIENT TO CONFER IMPROVED WORKING PROPERTIES TO THE COMPOSITION OF A FINELY DIVIDED DEAD BURNED GYPSUM ADDITIVE HAVING A BLAINE SURFACE AREA VALUE OF AT LEAST ABOUT 10,000 SQUARE CENTIMETERS PER GRAM.
Claim 2
Dependent Claim
48 words
A GYPSUM PLASTER COMPOSITION COMPRISING A MAJOR AMOUNT OF CALCIUM SULFATE HEMIHYDRATE AND A MINOR AMOUNT SUFFICIENT TO CONFER IMPROVED WORKING PROPERTIES TO THE COMPOSITION OF A FINELY DIVIDED DEAD BURNED GYPSUM ADDITIVE HAVING A BLAINE SURFACE AREA VALUE OF AT LEAST ABOUT 10,000 SQUARE CENTIMETERS PER GRAM.
References Cited (Backward Citations)
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Cited
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Cited
US2015676A
Cited
US2031585A
Cited
US2341426A
Cited
US2754220A
Cited
US2947643A
Cited
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Cited
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 |