Patent US3666664A successfully refreshed from Google Patents.
US3666664A
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Compositions and methods for controlling scale
Assignee: ChampionX LLC
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Filing: 1971-05-12
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Granted: 1972-05-30
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Expires: 1991-05-12
Abstract
Abstract Compositions and methods used to inhibit scale formation and/or the formation of solid scale forming salts comprises adding to water small amounts of a synergistic combination of nitrilotriacetic acid and a specific organophosphate.
Inventors
- 👤 Walter F Lorenc
- 👤 Roland A Berner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:24
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
16 words
The composition of claim 1 in which the nitrilotriacetic acid is present as the sodium salt.
Claim 2
Dependent Claim
15 words
The composition of claim 1 in which the organophosphonate is present as the potassium salt.
Claim 3
Dependent Claim
22 words
The liquid scale preventative composition of claim 1 which additionally contains from 1 to 10 percent by weight of a processed lignite.
Claim 4
Dependent Claim
30 words
A method of inhibiting the precipitation of scale forming salts in a water system comprising adding to said system from 0.5 to 1,000 ppm of the composition of claim 1.
Claim 5
Dependent Claim
59 words
A process for preventing scale deposits of at least one of barium sulfate, calcium sulfate, calcium carbonate, calcium silicate, magnesium sulfate and magnesium carbonate on metal surfaces and contact with water containing said scale forming chemicals which comprises contacting said metal surfaces with said water while maintaining therein an effective scale inhibiting amount of the composition of claim 1.
Claim 6
Dependent Claim
31 words
A method of inhibiting the precipitation of scale forming salts in a boiler system which comprises adding to said system from 0.5 to 1,000 ppm of the composition of claim 1.
Claim 7
Dependent Claim
13 words
The composition of claim 1 which comprises the additional ingredient of an antifoam.
Claim 8
Dependent Claim
20 words
The composition of claim 8 in which the antifoam comprises from 0.5 to 5 percent by weight of the composition.
Claim 9
Dependent Claim
13 words
The composition of claim 1 which comprises the additional ingredient of a polymer.
Claim 10
Dependent Claim
20 words
The composition of claim 10 in which the polymer comprises from 0.5 to 15 percent by weight of the composition.
Claim 11
Dependent Claim
25 words
The composition of claim 11 in which the polymer is a water soluble, sulfoxy-free polar addition polymer having a molecular weight of at least 1,000.
References Cited (Backward Citations)
US3549538A
Cited
US3393150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |