Patent US3009873A successfully refreshed from Google Patents.
US3009873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarification of aqueous organic suspensions
Assignee: Dow Chemical Co
•
Filing: 1956-03-05
•
Granted: 1961-11-21
•
Expires: 1976-03-05
Abstract
No abstract record available.
Inventors
- 👤 Jack D Kerr
- 👤 Robert F Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:59
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF FACILITATING THE SEPARATION OF CLARIFIED WATER FROM AQUEOUS SUSPENSION OF FINELY DIVIDED ORGANIC SOLIDS WHICH COMPRISES TO STEP OF INCORPORATING IN THE SUSPENSION A WATER-SOLUBLE SULFONATE OF A HIGH MOLECULAR WEIGHT POLY(VINYL-AROMATIC) COMPOUND OF THE BENZENE SERIES IN AN AMOUNT SUFFICIENT TO CAUSE FLOCCULATION AND INCREASE THE RATE OF SEDIMENTATION OF THE SUSPENDED SOLIDS, SAID SULFONATE BEING CHARACTERIZED BY A SULFONATE VISCOSITY OF FROM ABOUT 100 TO 2000 CENTIPOISES AND DERIVED BY SULFONATION OF A BASE POLYMER HAVING A SOLUTION VISCOSITY OF FROM ABOUT 300 TO ABOUT 100,000 CENTIPOISES.
Claim 2
Independent Claim
92 words
A METHOD OF FACILITATING THE SEPARATION OF CLARIFIED WATER FROM AQUEOUS SUSPENSION OF FINELY DIVIDED ORGANIC SOLIDS WHICH COMPRISES TO STEP OF INCORPORATING IN THE SUSPENSION A WATER-SOLUBLE SULFONATE OF A HIGH MOLECULAR WEIGHT POLY(VINYL-AROMATIC) COMPOUND OF THE BENZENE SERIES IN AN AMOUNT SUFFICIENT TO CAUSE FLOCCULATION AND INCREASE THE RATE OF SEDIMENTATION OF THE SUSPENDED SOLIDS, SAID SULFONATE BEING CHARACTERIZED BY A SULFONATE VISCOSITY OF FROM ABOUT 100 TO 2000 CENTIPOISES AND DERIVED BY SULFONATION OF A BASE POLYMER HAVING A SOLUTION VISCOSITY OF FROM ABOUT 300 TO ABOUT 100,000 CENTIPOISES.
References Cited (Backward Citations)
US2104728A
Cited
US2236930A
Cited
US2354146A
Cited
US2607750A
Cited
US2694702A
Cited
US2625529A
Cited
AT176184B
Cited
US2817649A
Cited
US2847403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |