US3989636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric composition with chelating properties
Assignee: ChampionX LLC
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Filing: 1975-06-19
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Granted: 1976-11-02
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Expires: 1995-06-19
Abstract
Abstract This invention discloses novel amino acid-epihalohydrin copolymers with good chelating properties.
Inventors
- 👤 Elmer Domba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:57
CPC Classifications
C; C08; C08G; C08G73/00; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A composition useful in preventing and removing hardness in boiler water consisting essentially of a copolymer of an amino acid chosen from the group consisting of glycine and aspartic acid, and an epihalohydrin, said copolymer having a molecular weight in the range of 300 to 700.
Claim 2
Dependent Claim
46 words
A composition useful in preventing and removing hardness in boiler water consisting essentially of a copolymer of an amino acid chosen from the group consisting of glycine and aspartic acid, and an epihalohydrin, said copolymer having a molecular weight in the range of 300 to 700.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein the ratio of amino acid to epihalohydrin is in the range of 0.5 to 2.0.
Claim 4
Dependent Claim
16 words
The composition of claim 1 wherein the amino acid is glycine and the epihalohydrin is epichlorohydrin.
Claim 5
Dependent Claim
29 words
A method of treating boiler water to prevent and remove hardness which comprises treating said boiler water with from 5 to 500 ppm of the composition of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |