US3425802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculation of impurities in alum solutions
Assignee: Wyeth Holdings LLC
•
Filing: 1962-09-26
•
Granted: 1969-02-04
•
Expires: 1982-09-26
Abstract
No abstract record available.
Inventors
- 👤 Robert Ben Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:01
CPC Classifications
B; B03; B03D; B03D3/00; B03D3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN THE PROCESS OF MANUFACTURING ALUM WHEREIN THE IMPURE HOT CONCENTRATED ACIDIC ALUM SOLUTION RESULTING FROM THE DIGESTION OF AN ORE OF ALUMINA WITH SULFURIC ACID IS CLARIFIED BY SETTLING SO AS TO REMOVE THE INSOLUBLES THEREFROM, THE IMPROVEMENT WHICH COMPRISES CLARIFYING THE ALUM SOLUTION BY ADDING THERETO FROM ABOUT 0.5 LB. TO ABOUT 3.0 LBS. PER TON OF DRY SOLIDS OF A WATER-SOLUBLE ACRYLIC ACID-ACRYLAMIDE COPOLYME HAVING AT LEAST 60, OF THE MONOMER UNITS ATTACHED TO AMIDE GROUPS, SAID COPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 10,000.
Claim 2
Dependent Claim
90 words
IN THE PROCESS OF MANUFACTURING ALUM WHEREIN THE IMPURE HOT CONCENTRATED ACIDIC ALUM SOLUTION RESULTING FROM THE DIGESTION OF AN ORE OF ALUMINA WITH SULFURIC ACID IS CLARIFIED BY SETTLING SO AS TO REMOVE THE INSOLUBLES THEREFROM, THE IMPROVEMENT WHICH COMPRISES CLARIFYING THE ALUM SOLUTION BY ADDING THERETO FROM ABOUT 0.5 LB. TO ABOUT 3.0 LBS. PER TON OF DRY SOLIDS OF A WATER-SOLUBLE ACRYLIC ACID-ACRYLAMIDE COPOLYME HAVING AT LEAST 60, OF THE MONOMER UNITS ATTACHED TO AMIDE GROUPS, SAID COPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 10,000.
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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |