US3647769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction products of polynitriles water and amines
Assignee: Diamond Shamrock Corp
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Filing: 1969-11-14
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Granted: 1972-03-07
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Expires: 1989-11-14
Abstract
Abstract WATER SOLUBLE REACTION PRODUCTS ARE PRODUCED BY REACTION OF A POLYMER OR COPOLYMER OF ACRYLONITRILE WITH A PRIMARY AMINE, A SECONDARY AMINE OR A POLYAMINE HAVING A PRIMARY OR SECONDARY AMINE GROUP IN THE PRESENCE OF WATER. THESE REACTION PRODUCTS ARE USEFUL AS FLOCCULANTS IN THE SEPARATION OF SUSPENDED SOLIDS FROM AQUEOUS SYSTEMS. THE REACTION PRODUCT OF POLYACRYLONITRILE, WATER AND N,N-DIMETHYL-1,3-PROPANEDIAMINE IS A USEFUL FLOCCLANT IN TREATMENT OF PROCESS WATER IN PAPER MAKING.
Inventors
- 👤 Richard G Bufton
- 👤 John R Semancik
- 👤 George G King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:41
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; B; B01; B01J; B01J20/00; B01J20/22; C08; C08F; C08F8/00; Y; Y10; Y10S; Y10S524/00; Y10S524/922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |