Patent US3072255A successfully refreshed from Google Patents.
US3072255A
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US
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Method of brightening clay by froth flotation of sulfidized clay pulp
Assignee: Minerals and Chemicals Philipp Corp
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Filing: 1960-03-11
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Granted: 1963-01-08
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Expires: 1980-03-11
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Greene
- 👤 James B Duke
- 👤 Joseph L Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:03
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD OF IMPROVING THE BRIGHTNESS OF GRAY KAOLIN CLAY COMPRISING DISPERSING GRAY KAOLIN CLAY IN WATER CONTAINING H2S SO AS TO FORM A DISPERSED CLAY PULP, AGING SAID PULP FOR A TIME SUFFICIENT TO EFFECT SUBSTANTIAL BLACKENING THEREOF, CONDITIONING SAID PULP FOR FROTH FLOTATION WITH (1) A COLLECTOR REAGENT CAPABLE OF SELECTIVELY OILING COLORED IMPURITIES IN SAID CLAY AND (2) FINELY DIVIDED SOLID PARTICLES CAPABLE OF FLOATING IN SAID PULP, AND SUBJECTING THE THUSCONDITIONED AQUEOUS PULP TO FROTH FLOATATION IN AM ALKALINE CIRCUIT THEREBY PRODUCING A FROTH PRODUCT WHICH IS A CONCENTRATE OF COLORED IMPURITIES IN SAID PULP IN INTIMATE COMBINATION WITH SAID FINELY DIVIDED SOLID PARTICLES AND A MACHINE DISCHARGE PRODUCT WHICH IS A CONCENTRATE OF CLAY OF ENHANCED BRIGHTNESS.
Claim 2
Independent Claim
122 words
A METHOD OF IMPROVING THE BRIGHTNESS OF GRAY KAOLIN CLAY COMPRISING DISPERSING GRAY KAOLIN CLAY IN WATER CONTAINING H2S SO AS TO FORM A DISPERSED CLAY PULP, AGING SAID PULP FOR A TIME SUFFICIENT TO EFFECT SUBSTANTIAL BLACKENING THEREOF, CONDITIONING SAID PULP FOR FROTH FLOTATION WITH (1) A COLLECTOR REAGENT CAPABLE OF SELECTIVELY OILING COLORED IMPURITIES IN SAID CLAY AND (2) FINELY DIVIDED SOLID PARTICLES CAPABLE OF FLOATING IN SAID PULP, AND SUBJECTING THE THUSCONDITIONED AQUEOUS PULP TO FROTH FLOATATION IN AM ALKALINE CIRCUIT THEREBY PRODUCING A FROTH PRODUCT WHICH IS A CONCENTRATE OF COLORED IMPURITIES IN SAID PULP IN INTIMATE COMBINATION WITH SAID FINELY DIVIDED SOLID PARTICLES AND A MACHINE DISCHARGE PRODUCT WHICH IS A CONCENTRATE OF CLAY OF ENHANCED BRIGHTNESS.
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |