US3579488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble copolymers of alkylenimine and alkylene sulfide
Assignee: Dow Chemical Co
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Filing: 1969-01-16
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Granted: 1971-05-18
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Expires: 1989-01-16
Abstract
Abstract WATER-SOLUBLE COPOLYMERS OF A C2-C4 ALKYLENIMINE AND A C2-C4 ALKYLENE SULFIDE ARE OBTAINED BY AN ACID CATALYZED COPOLYMERIZATION USING AS A CATALYST ABOUT 3-15 MOLE PERCENT BASED ON TOTAL MONOMER OF A STRONG WATER-SOLUBLE ORGANIC ACID, PREFERABLY AN AROMATIC SULFONIC ACID. THE RESULTING WATER-SOLUBLE COPOLYMERS, HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 5-50 THOUSAND CONTAIN ABOUT 1040 MOLE PERCENT COPOLYMERIZED ALKYLENE SULFIDE AND ARE EFFECTIVE DISPERSANTS AND DEWATERING AGENTS IN SEWAGE TREATMENT AND ALSO HAVE FLOCCULANT ACTIVITY.
Inventors
- 👤 Giffin D Jones
- 👤 Nancy B Tefertiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:26
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/06; C08G75/08; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213
Claims Analysis
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |