US3146193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous suspension clarification method
Assignee: Dow Chemical Co
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Filing: 1960-04-04
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Granted: 1964-08-25
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Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 Edward J Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A METHOD FOR CONCENTRATING FINELY DIVIDED INORGANIC SOLIDS FROM AN AQUEOUS SUSPENSION THEREOF WHICH COMPRISES ADMIXING WITH SAID SUSPENSION A WATER-SOLUBLE COPOLYMER PREPARED BY COPOLYMERIZATION THROUGH THE ETHYLENIC DOUBLE BONDS OF A MIXTURE OF FROM ABOUT 80 TO 99 PERCENT BY WEIGHT OF ACRYLAMIDE WITH CORRESPONDINGLY FROM ABOUT 20 TO ABOUT ONE PERCENT BY WEIGHT OF A MONOVINYL HETEROCYCLIC RING COMPOUND SELECTED FROM THE GROUP CONSISTING OF N-VINYL-2-OXAZOLIDONE, N-VINYL-5-METHYL2-OXAZOLIDINONE AND N-VINYLPYRROLIDONE, SAID COPOLYMER BEING CHARACTERIZED BY A VISCOSITY OF AT LEAST 2 CENTIPOISES FOR A 0.5 PERCENT BY WEIGHT SOLUTION THEREOF IN DISTILLED WATER ADJUSTED TO A PH OF 3 TO 3.5 AND A TEMPERATURE OF 25*C. AND BEING EMPLOYED IN AMOUNT SUFFICIENT TO CAUSE ACCELERATED SEDIMENTATION OF THE SUSPENDED SOLIDS, AND MAINTAINING THE TREATED SUSPENSION UNDER QUIESCENT CONDITIONS TO SEPARATE A CLARIFIED SUPERNATANT LIQUID LAYER AND A CONCENTRATED SOLIDS SUSPENSION LAYER.
Claim 2
Independent Claim
142 words
A METHOD FOR CONCENTRATING FINELY DIVIDED INORGANIC SOLIDS FROM AN AQUEOUS SUSPENSION THEREOF WHICH COMPRISES ADMIXING WITH SAID SUSPENSION A WATER-SOLUBLE COPOLYMER PREPARED BY COPOLYMERIZATION THROUGH THE ETHYLENIC DOUBLE BONDS OF A MIXTURE OF FROM ABOUT 80 TO 99 PERCENT BY WEIGHT OF ACRYLAMIDE WITH CORRESPONDINGLY FROM ABOUT 20 TO ABOUT ONE PERCENT BY WEIGHT OF A MONOVINYL HETEROCYCLIC RING COMPOUND SELECTED FROM THE GROUP CONSISTING OF N-VINYL-2-OXAZOLIDONE, N-VINYL-5-METHYL2-OXAZOLIDINONE AND N-VINYLPYRROLIDONE, SAID COPOLYMER BEING CHARACTERIZED BY A VISCOSITY OF AT LEAST 2 CENTIPOISES FOR A 0.5 PERCENT BY WEIGHT SOLUTION THEREOF IN DISTILLED WATER ADJUSTED TO A PH OF 3 TO 3.5 AND A TEMPERATURE OF 25*C. AND BEING EMPLOYED IN AMOUNT SUFFICIENT TO CAUSE ACCELERATED SEDIMENTATION OF THE SUSPENDED SOLIDS, AND MAINTAINING THE TREATED SUSPENSION UNDER QUIESCENT CONDITIONS TO SEPARATE A CLARIFIED SUPERNATANT LIQUID LAYER AND A CONCENTRATED SOLIDS SUSPENSION LAYER.
References Cited (Backward Citations)
US2625529A
Cited
US2688550A
Cited
US2740522A
Cited
US2937143A
Cited
GB760653A
Cited
US2894603A
Cited
US2955932A
Cited
US2872321A
Cited
US2872322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |