US2920832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improving clay brightness by flotation and fine grinding
Assignee: Minerals & Chemicals Corp Of A
•
Filing: 1957-12-16
•
Granted: 1960-01-12
•
Expires: 1977-12-16
Abstract
No abstract record available.
Inventors
- 👤 James B Duke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:14
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D1/002; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD FOR IMPROVING THE BRIGHTNESS OF COARSE KAOLIN CLAY COMPRISING DISPERSING SAID CLAY IN AN AQUEOUS MEDIUM TO FORM AN AQUEOUS PULP OF SAID CLAY, SUBJECTING SAID AQUEOUS PULP TO NEGATIVE-ION FROTH FLOTATION TREATMENT WITH A NEGATIVE-ION REAGENT TO THEREBY PRODUCE A FORTH-PRODUCT MATERIAL WHICH IS A CONCENTRATE OF THE COLORED IMPURITIES IN THE ORIGINAL CLAY AND A MACHINE DISCHARGE SLURRY INCLUDING KAOLIN CLAY OF IMPROVED BRIGHTNESS, FORMING SAID SLURRY INTO A FLOWING CONFINED STREAM, VAPORIZING AT LEAST A PORTION OF THE LIQUID COMPONENT OF SAID STREAM TO FORM A DISPERSION OF CLAY PARTICLES IN THE RESULTING VAPOR AND SUBJECTING THE DISPERSION TO TURBULENCE AND HIGH VELOCITY WHEREBY SAID PARTICLES IMPINGE AGAINST ONE ANOTHER AND DISINTEGRATE TO RELATIVELY FINE PARTICLES OF ENHANCED BRIGHTNESS.
Claim 2
Independent Claim
124 words
A METHOD FOR IMPROVING THE BRIGHTNESS OF COARSE KAOLIN CLAY COMPRISING DISPERSING SAID CLAY IN AN AQUEOUS MEDIUM TO FORM AN AQUEOUS PULP OF SAID CLAY, SUBJECTING SAID AQUEOUS PULP TO NEGATIVE-ION FROTH FLOTATION TREATMENT WITH A NEGATIVE-ION REAGENT TO THEREBY PRODUCE A FORTH-PRODUCT MATERIAL WHICH IS A CONCENTRATE OF THE COLORED IMPURITIES IN THE ORIGINAL CLAY AND A MACHINE DISCHARGE SLURRY INCLUDING KAOLIN CLAY OF IMPROVED BRIGHTNESS, FORMING SAID SLURRY INTO A FLOWING CONFINED STREAM, VAPORIZING AT LEAST A PORTION OF THE LIQUID COMPONENT OF SAID STREAM TO FORM A DISPERSION OF CLAY PARTICLES IN THE RESULTING VAPOR AND SUBJECTING THE DISPERSION TO TURBULENCE AND HIGH VELOCITY WHEREBY SAID PARTICLES IMPINGE AGAINST ONE ANOTHER AND DISINTEGRATE TO RELATIVELY FINE PARTICLES OF ENHANCED BRIGHTNESS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |