Patent US3756257A successfully refreshed from Google Patents.
US3756257A
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Acrylic composition for water treatment and process for making same
Assignee: Magna Corp
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Filing: 1971-10-04
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Granted: 1973-09-04
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Expires: 1991-10-04
Abstract
Abstract This invention relates to an acrylic composition; a process for obtaining the acrylic composition; to the use of such composition to remove and/or inhibit scale formation in water treatment apparatuses, oil and gas wells, producing formations, and other scale-containing or -attracting surfaces. Said novel composition is formed from about 80 to 90 parts by weight acrylic acid, about 7 to 15 parts by weight thioglycolic acid, and about 1.5 to 5 parts by weight ammonium persulfate.
Inventors
- 👤 H Rice
- 👤 A Cizek
- 👤 M Thaemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:11
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/24; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/105; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/939
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
The process of claim 1 wherein the said scale comprises calcium carbonate and calcium sulfate.
Claim 2
Dependent Claim
23 words
The process of claim 2 wherein the said metallic surface is the internal metallic lining of boiler, evaporator and desalination vessels and conduits.
Claim 3
Dependent Claim
18 words
The process of claim 2 wherein the said metallic surface is the internal surface of a subterranen well.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the said composition is neutralized to a pH of between about 5 and about 8 to produce a neutralized salt composition.
Claim 5
Dependent Claim
104 words
A process for the removal of scale deposits upon a metallic suRface comprising the steps of: a. Adding to an aqueous system at least about 20 p.p.m. of a composition consisting essentially of the product formed by the reaction at a temperature of from about 24*C to about 80*C in an inert solvent of 80 to 90 parts by weight acrylic acid, 7 to 15 parts by weight thioglycolic acid, and 1.5 to 5 parts by weight ammonium persulfate; and b. Circulating over and throughout said metallic surface the said aqueous system at least until said scale is substantially removed from said metallic surface.
Claim 6
Dependent Claim
27 words
The process of claim 6 wherein the said composition is neutralized to a pH of between about 5 and about 8 to produce a neutralized salt composition.
Claim 7
Dependent Claim
15 words
The process of claim 6 wherein the said scale comprises calcium carbonate and calcium sulfate.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the said metallic surface is the internal metallic lining of boiler, evaporator, and desalination vessels and conduits.
Claim 9
Dependent Claim
18 words
The process of claim 6 wherein the said metallic surface is the internal surface of a subterranean well.
References Cited (Backward Citations)
US3293152A
Cited
US3575868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |