US3827897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of obtaining a dry and powdery mixture of hydrated lime and plaster
Assignee: CARRIERE ET FOURS A CHAUX DUMO
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Filing: 1972-05-31
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Granted: 1974-08-06
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Expires: 1992-05-31
Abstract
Abstract FOR OBTAINING A BUILDING MATERIAL CONTAINING HYDRATED LIME AND PLASTER, QUICKLIME IS REACTED WITH SYNTHETIC GYPSUM, SUCH AS PHOSPHOGYPSUM WHICH IS A BYPRODUCT OF THE MANUFACTURE OF PHOSPHORIC ACID, THE REACTION TAKING PLACE WITHOUT EXTERNAL HEATING IN A REACTION ZONE IN WHICH A WATER SATURATED ATMOSPHERE IS MAINTAINED.
Inventors
- 👤 P Dumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:55
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |