Patent US3645896A successfully refreshed from Google Patents.
US3645896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film forming hydrazine-containing corrosion inhibitor
Assignee: Marathon Oil Co
•
Filing: 1969-01-10
•
Granted: 1972-02-29
•
Expires: 1989-01-10
Abstract
Abstract CORROSION RATES IN OIL WELLS ARE REDUCED BY INJECTING INCOMBINATION FROM ABOUT 5 TO ABOUT 200 P.P.M. OF A FILM-FORMING NITROGEN-CONTAINING CORROSION INHIBITOR (E.G. AN IMIDAZOLINE COMPOUND) AND 0.01-1.0 P.P.M. OF HYDRAZINE. SUCH IS SPECIALLY USEFUL WITH WATER INJECTION WELLS.
Inventors
- 👤 Arthur L Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:17
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C09; C09K; C09K8/00; C09K8/54; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |