US5286390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating deink wastes using melamine aldehyde-type polymers
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1992-09-30
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Granted: 1994-02-15
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Expires: 2012-09-30
Abstract
Abstract A method for treating an ink-laden wastewater stream comprising adding an effective amount of a melamine-aldehyde polymer to the ink laden stream being treated and segregating at least some portion of the resulting ink-laden agglomerated solids from the treated water.
Inventors
- 👤 Ross T. Gray
- 👤 Denis E. Hassick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:44
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
A method for separating ink-laden solids and turbidity from an ink-laden wastewater stream produced in a secondary fiber deinking operation, which method comprises: a) adding to said ink-laden wastewater stream at least about 0.1 ppm, on an active basis, of a melamine formaldehyde acid colloid polymer, thereby causing formation of an ink-laden floc including said ink-laden solids and said turbidity, and b) segregating said ink-laden floc from said ink-laden wastewater stream.
Claim 2
Independent Claim
71 words
A method for separating ink-laden solids and turbidity from an ink-laden wastewater stream produced in a secondary fiber deinking operation, which method comprises: a) adding to said ink-laden wastewater stream at least about 0.1 ppm, on an active basis, of a melamine formaldehyde acid colloid polymer, thereby causing formation of an ink-laden floc including said ink-laden solids and said turbidity, and b) segregating said ink-laden floc from said ink-laden wastewater stream.
Claim 3
Dependent Claim
28 words
The method of claim 1, which additionally comprises adding an effective amount of a flocculant polymer to facilitate segregation of said ink-laden floc from said ink-laden wastewater stream.
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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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |