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US4361492A
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Particulate dispersant enhancement using acrylamide-acrylic acid copolymers
Assignee: ChampionX LLC
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Filing: 1981-04-09
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Granted: 1982-11-30
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Expires: 2001-04-09
Abstract
Abstract A method of enhancing the activity of water-soluble, low molecular weight polymeric dispersants used to suspend iron oxides in cooling waters which also contain soluble iron compounds comprises treating such waters with the water-soluble, low molecular weight polymeric dispersant and a water-soluble copolymer consisting of 25% by weight of acrylic acid and 75% by weight acrylamide with the ratio of copolymer to soluble iron being 1:1.
Inventors
- 👤 Leonard Dubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:35
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
66 words
A method of enhancing the activity of water-soluble, low molecular weight polymeric dispersants used to suspend iron oxides in cooling waters which also contain soluble iron compounds comprises treating such waters with the water-soluble, low molecular weight polymeric dispersant and a water-soluble copolymer consisting of 25% by weight of acrylic acid and 75% by weight acrylamide with the ratio of copolymer to soluble iron being 1:1.
Claim 2
Independent Claim
66 words
A method of enhancing the activity of water-soluble, low molecular weight polymeric dispersants used to suspend iron oxides in cooling waters which also contain soluble iron compounds comprises treating such waters with the water-soluble, low molecular weight polymeric dispersant and a water-soluble copolymer consisting of 25% by weight of acrylic acid and 75% by weight acrylamide with the ratio of copolymer to soluble iron being 1:1.
Claim 3
Dependent Claim
17 words
The method of claim 1 where the polymer has a molecular weight within the range of 1000-20,000.
References Cited (Backward Citations)
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US4175100A
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US4279768A
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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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |