US4784776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating aqueous suspension
Assignee: Atlantic Richfield Co
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Filing: 1986-09-19
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Granted: 1988-11-15
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Expires: 2006-09-19
Abstract
Abstract Blends of formaldehyde-based aminoplast resins and water-soluble amines are employed in the purifications of aqueous liquids which contain suspended matter.
Inventors
- 👤 Francis J. Mangravite, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:55
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08L; C08L61/00; C08L61/20; C08L61/26; C08L61/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
An improved process for removing suspended matter from coal pile run-off water comprising contacting said coal pile run-off water with a flocculating agent comprising a mixture of a water dispersible melamine-formaldehyde resin and a diallyldialkylammonium halide polymer, the weight ratio of said water dispersible resin to said polymer being about 90:10.
Claim 2
Dependent Claim
51 words
An improved process for removing suspended matter from coal pile run-off water comprising contacting said coal pile run-off water with a flocculating agent comprising a mixture of a water dispersible melamine-formaldehyde resin and a diallyldialkylammonium halide polymer, the weight ratio of said water dispersible resin to said polymer being about 90:10.
Claim 3
Dependent Claim
22 words
The improved process of claim 1, wherein said diallyldialkylammonium halide comprises diallyldimethylammonium chloride, diallyldimethylammonium bromide, diallyldiethylammonium chloride, diallylethylmethylammonium chloride or diallyldidecylammonium bromide.
Claim 4
Dependent Claim
13 words
The improved process of claim 2, wherein said diallyldialkylammonium halide is diallyldimethylammonium chloride.
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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |