US3194757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for clarifying red muds
Assignee: —
•
Filing: —
•
Granted: 1965-07-13
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Expires: 1982-07-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:58
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/12; B01D; B01D21/00; B01D21/01; B03; B03D; B03D3/00; B03D3/06; C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
IN A PROCESS FOR CLARIFYING RED MUDS OBTAINED BY THE ALKALI METAL HYDROXIDE DIGESTION OF ALUMINIFEROUS ORES, THE IMPROVEMENT WHICH CONSISTS IN ADDING TO THE RED MUD A SMALL BUT EFFECTIVE AMOUNT OF AN ULTRAHIGH MOLECULAR WEIGHT POLYVINYL AROMATIC SULFONATE CHARACTERIZED BY A REDUCED VISCOSITY NUMBER OF AT LEAST ABOUT 17 AND A FLOW INDEX RATIO OF AT LEAST 1.7.
Claim 2
Dependent Claim
60 words
IN A PROCESS FOR CLARIFYING RED MUDS OBTAINED BY THE ALKALI METAL HYDROXIDE DIGESTION OF ALUMINIFEROUS ORES, THE IMPROVEMENT WHICH CONSISTS IN ADDING TO THE RED MUD A SMALL BUT EFFECTIVE AMOUNT OF AN ULTRAHIGH MOLECULAR WEIGHT POLYVINYL AROMATIC SULFONATE CHARACTERIZED BY A REDUCED VISCOSITY NUMBER OF AT LEAST ABOUT 17 AND A FLOW INDEX RATIO OF AT LEAST 1.7.
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) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |