US3677703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying hydrates of calcined dolomite and magnesite
Assignee: G&WH Corson Inc
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Filing: 1970-07-14
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Granted: 1972-07-18
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Expires: 1990-07-14
Abstract
Abstract DRY, DIHYDRATED CALCINE DOLOMITE OR DRY HYDRATED CALCINED MAGNESITE, HAVING A PARTICLE SIZE DISTRIBUTION SUCH THAT AT LEAST THE MAJOR PORTION AND UP TO ABOUT 95% THEREOF, IS -325 MESH AND THE REMAINDER IS LARGER THAN 325 MESH, IS DISPERSED INTO AN UPWARDLY MOVING STREAM OF AIR, IN A CONFINED ZONE, ADAPTED IN CONJUNCTION WITH CENTRIFUGAL FORCE ACTING PRIMARLY ON THE LARGE PARTICLES SELECTIVELY TO CARRY A FINE FRACTION OF THE HYDRATE UPWARDLY AND OUTWARDLY TO A ZONE SEPARATE AND DISTINCT FROM THAT TO WHICH THE REMAINDERR IS DIRECTED, AND THE FINE FRACTION. WHICH HAS A LOWER SILICA CONTENT THAN THAT OF THE ORIGINAL HYDRATE IS SEPARATELY RECOVERED.
Inventors
- 👤 Leonard John Minnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:31
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/04; C04B33/06; C01; C01F; C01F5/00; C01F5/14; C01F5/16; C04B33/30; C04B35/00; C04B35/01; C04B35/03; C01P; C01P2004/00; C01P2004/60; C01P2004/61
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |