US3573947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accelerator for gypsum plaster
Assignee: United States Gypsum Co
•
Filing: 1968-08-19
•
Granted: 1971-04-06
•
Expires: 1988-08-19
Abstract
Abstract A PROCESS FOR PRODUCING AN ACCELERATOR FOR A CALCIUM SULFATE PLASTER COMPRISING THE STEPS OF GRINDING TOGETHER CALCIUM SULFATE DIHYDRATE AND SUCROSE AT A TEMPERATURE OF UP TO ABOUT 145*F. UNTIL THE SURFACE AREA OF THE MIXTURE IS SUBSTANTIALLY INCREASED, AND HEATING THE GROUND MIXTURE UNDER CONDITIONS WHICH ESSENTIALLY PRECLUDE THE FORMATION OF A DEWPOINT CONDITION IN THE MIXTURE TO A FINAL MOISTURE CONTENT FROM ABOUT 6% TO ABOUT 14% BY WEIGHT.
Inventors
- 👤 William Kinkade
- 👤 Eugene Edward O'neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:46
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B28/00; C04B28/14; C04B2103/00; C04B2103/10; C04B2103/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |