US3620974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale inhibition
Assignee: ChampionX LLC
•
Filing: 1969-09-11
•
Granted: 1971-11-16
•
Expires: 1989-09-11
Abstract
Abstract Phosphated hydroxy amines obtained by reacting polyphosphoric acid or phosphorus pentoxide with hydroxyamines, e.g., diethanolamine or triethanolamine, with or without neutralization, are used as scale inhibitors in brines, especially in oil wells, where calcium and barium salts are present.
Inventors
- 👤 James R Stanford
- 👤 Paul G Vogelsang Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:56
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
26 words
A process as claimed in claim 1 in which said hydroxy amine contains one to six amino nitrogen atoms and not more than Six hydroxyl groups.
Claim 2
Dependent Claim
21 words
A process as claimed in claim 1 wherein said amount is 0.5 to 100 parts per million parts of said water.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1 in which said ester is at least partially in the form of a salt thereof.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 1 wherein said water is a natural hard water or brine.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1 in which said water is a cooling water.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 1 in which said water is a boiler feed water.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 1 in which said water is a disposal water.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 1 in which said water is in an underground oil-producing formation.
Claim 9
Dependent Claim
29 words
A process as claimed in claim 1 in which said phosphate ester is added to water used in a water flood system to increase the production of oil wells.
Claim 10
Dependent Claim
28 words
A process as claimed in claim 1 in which said hydroxy amine contains two to six nitrogen atoms connected by alkylene groups containing two to six carbon atoms.
Claim 11
Dependent Claim
31 words
A process as claimed in claim 1 in which said hydroxy amine is a diamine having the amino nitrogen atoms connected by an alkylene chain of two to six carbon atoms.
Claim 12
Dependent Claim
15 words
A process as claimed in claim 12 in which said diamine is oxyethylated propylene diamine.
Claim 13
Dependent Claim
15 words
A process as claimed in claim 12 in which said diamine is oxyethylated hexamethylene diamine.
Claim 14
Dependent Claim
39 words
A process as claimed in claim 1 in which said hydroxyamine is an oxyalkylated dipropylene triamine containing not more than 30 moles of two to four carbon alkylene oxide per mole of amine and having a terminal 2-hydroxyethyl group.
Claim 15
Dependent Claim
39 words
A process as claimed in claim 1 in which said hydroxyamine is an oxyalkylated propylene diamine containing not more than 30 moles of two to four carbon alkylene oxide per mole of amine and having a terminal 2-hydroxyethyl group.
Claim 16
Dependent Claim
39 words
A process as claimed in claim 1 in which said hydroxyamine is an oxyalkylated hexamethylene diamine containing not more than 30 moles of two to four carbon alkylene oxide per mole of amine and having a terminal 2-hydroxyethyl group.
References Cited (Backward Citations)
US3477956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |