Patent US3253791A successfully refreshed from Google Patents.
US3253791A
Expired / Lapsed
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Method of treating kaolin
Assignee: Mineral Industries Corp of America
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Filing: 1964-12-21
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Granted: 1966-05-31
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Expires: 1984-12-21
Abstract
No abstract record available.
Inventors
- 👤 Morris I Cohn
- 👤 Roy D Perdue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:04
CPC Classifications
B; B03; B03B; B03B9/00; C; C04; C04B; C04B33/00; C04B33/02; C04B33/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF PURIFYING CLAY COMPRISING THE STEP OF FORCING A LIQUID SLURRY OF PARTICLES OF SAID CLAY IN THE FORM OF A THIN FILM EDGEWISE THROUGH A THIN, HARD-SURFACED GAP UNDER A HIGH PRESSURE AND AT AN EXTREMELY HIGH VELOCITY BY VIRTUE OF REDUCTION OF SAID HIGH PRESSURE TO A SUBSTANTIALLY LOWER PRESSURE, AND THE STEP OF SUBJECTING THE SLURRY DISCHARGED FROM SAID GAP TO A HYDROCLASSIFYING STEP, WHEREBY THE AMOUNT OF IMPURITIES SEPARATED FROM SAID CLAY BY SAID HYDROCLASSIFYING STEP IN INCREASED BY SAID STEP OF FORCING SAID SLURRY THROUGH SAID GAP.
Claim 2
Independent Claim
94 words
A METHOD OF PURIFYING CLAY COMPRISING THE STEP OF FORCING A LIQUID SLURRY OF PARTICLES OF SAID CLAY IN THE FORM OF A THIN FILM EDGEWISE THROUGH A THIN, HARD-SURFACED GAP UNDER A HIGH PRESSURE AND AT AN EXTREMELY HIGH VELOCITY BY VIRTUE OF REDUCTION OF SAID HIGH PRESSURE TO A SUBSTANTIALLY LOWER PRESSURE, AND THE STEP OF SUBJECTING THE SLURRY DISCHARGED FROM SAID GAP TO A HYDROCLASSIFYING STEP, WHEREBY THE AMOUNT OF IMPURITIES SEPARATED FROM SAID CLAY BY SAID HYDROCLASSIFYING STEP IN INCREASED BY SAID STEP OF FORCING SAID SLURRY THROUGH SAID GAP.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |