US3652479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble mixtures of amino-condensation polymers and cationic vinyl addition polymers for sludge conditioning
Assignee: Dow Chemical Co
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Filing: 1968-05-29
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Granted: 1972-03-28
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Expires: 1988-05-29
Abstract
Abstract COMPOSITIONS CONTAINING 1 PART BY WEIGHT OF A WATERSOLUBLE AMINO-CONDENSATION POLYMER SUCH AS A POLYALKYLENE POLYAMINE PER 0.02-0.3 PART BY WEIGHT OF A WATERSOLUBLE, CATIONIC VINYL-ADDITION POLYMER SUCH AS THOSE WHICH CONTAIN A PLURALITY OF AMINOALKYL-N-ACRYLAMIDE UNITS. THE POLYMER MIXTURES ARE USEFUL IN DEWATERING SLUDGE AND MAY BE APPLIED IN THE FORM OF AN AQUEOUS SOLUTION.
Inventors
- 👤 Stanley Mogelnicki
- 👤 Eugene M Gatza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:32
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; B; B01; B01J; B01J20/00; B01J20/22; C02F11/00; C02F11/12; C08; C08L; C08L79/00; C08L79/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |