Patent US3644205A successfully refreshed from Google Patents.
US3644205A
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US
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Inhibition of aqueous systems from deposition of scale
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-07-10
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Granted: 1972-02-22
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Expires: 1990-07-10
Abstract
Abstract The deposition of scale-forming salts from an aqueous system containing a scale-forming amount of a salt such as calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate, strontium carbonate and magnesium carbonate is inhibited by adding to the system an effective amount of triorthophosphate ester of trimethylol propane and the alkali metal and ammonium salts thereof. The aqueous system is suitably a brine in a subsurface formation to which the inhibitor is added.
Inventors
- 👤 William G Depierri Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:54
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
A method in accordance with claim 1 in which the compound is: and the water-insoluble salt is calcium carbonate.
Claim 2
Dependent Claim
20 words
A method in accordance with claim 1 in which the compound is: and the water insoluble salt is barium sulfate.
Claim 3
Dependent Claim
19 words
A method in accordance with claim 1 in which the compound is: and the water-insoluble salt is strontium sulfate.
Claim 4
Dependent Claim
28 words
A method in accordance with claim 4 in which the aqueous system is a brine in a subsurface formation and the compound is introduced into the subsurface formation.
Claim 5
Dependent Claim
27 words
A method in accordance with claim 4 in which the effective amount is within the range from about 1 to about 50 p.p.m. of the aqueous system.
Claim 6
Dependent Claim
20 words
A method in accordance with claim 1 in which the compound is: and the water insoluble salt is calcium sulfate.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |