US3597352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale inhibitors
Assignee: ChampionX LLC
•
Filing: 1967-11-02
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Granted: 1971-08-03
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Expires: 1987-11-02
Abstract
Abstract PHOSPHATED SURFACE ACTIVE HYDROXY AMINES OBTAINED BY REACTING POLYPHOSPHORIC ACID AND/OR PHOSPHOURS PENTOXIDE WITH SURFACE ACTIVE HYDROXYAMINES, E.G., C8 TO C 18 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
2026-10-27 17:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; E; E21; E21B; E21B43/00; E21B43/16; E21B43/20; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |