US3692881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphated surface active hydroxy amines
Assignee: ChampionX LLC
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Filing: 1969-12-09
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Granted: 1972-09-19
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Expires: 1989-12-09
Abstract
Abstract Phosphated surface active hydroxy amines obtained by reacting polyphosphoric acid and/or phosphorus pentoxide with surface active hydroxyamines, e.g., C8 to C18 amines, with or without one or more hydroxy hydrocarbons, 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
2026-11-05 18:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/091; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1673; C23F14/00; C23F14/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A phosphate ester as claimed in claim 1 in which said hydroxy amine contains at least two hydroxyethyl groups.
Claim 2
Dependent Claim
19 words
An ester as claimed in claim 1 which has been at least partially neutralized to a water soluble salt.
References Cited (Backward Citations)
US3210192A
Cited
US3380927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |