US3592670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum slurry set acceleration method
Assignee: National Gypsum Co
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Filing: 1969-02-03
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Granted: 1971-07-13
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Expires: 1989-02-03
Abstract
Abstract A METHOD OF ACCELERATING THE SETTING TIME OF A CALCINED GYPSUM SLURRY DURING THE MANUFACTURE OF A GYPSUM PRODUCT SUCH AS WALLBOARD OR THE LIKE COMPRISING THE USE OF AN AQUEOUS SUSPENSION OF FRESHLY HYDRATED, FINE, CALCIUM SUIFATE DIHYDRATE CRYSTALS AND A SATURATED CALCIUM SULFATE DIHYDRATE SOLUTION, SAID SATURATED CALCIUM SULFATE DIHYDRATE SOLUTION COMPRISING A MAJOR PERCENTAGE BY VOLUME OF THE TOTAL WATER CONTENT OF THE CALCINED GYPSUM SLURRY FROM WHICH THE SAID GYPSUM IS MADE.
Inventors
- 👤 Donald A Kossuth
- 👤 Daniel A Winkowski
- 👤 John W Klems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:35
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2103/00; C04B2103/10; C04B2103/12; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |