US3561930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of calcium sulphate hemihydrate by a heated centrifuge
Assignee: INPERIAL CHEMICAL IND Ltd
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Filing: 1967-04-24
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Granted: 1971-02-09
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Expires: 1987-04-24
Abstract
Abstract METHOD FOR THE SEPARATION OF A HYDRAULIC BINDING MATERIAL, E.G. CALCIUM SULPHATE HEMIHYDRAGE, FROM WATER. THE METHOD INVOLVES CENTRIFUGING AN AQUEOUS SLURRY OF THE BINDING MATERIAL IN A CENTRIFUGING ZONE AND REMOVING THE SEPARATED MOIST SOLID MATERIAL AND THE SEPARATED WATER FROM DIFFERENT PARTS OF THE ZONE, AT LEAST ONE SURFACE UPON WHICH THE SEPARATED MOIST SOLID MATERIAL IS LIABLE TO BE DEPOSITED BEING HEATED TO A TEMPERATURE WHICH IS AT LEAST 100*C. AND AT WHICH HYDRATION OF THE MATERIAL IS SUBSTANTIALLY PREVENTED. APPARATUS FOR CARRYING OUT THE XXXXXXXXXX ALSO DESCRIBED.
Inventors
- 👤 Martin Granger Brown
- 👤 Edward Graham Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:12
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |