US4235838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of benzazoles as corrosion inhibitors
Assignee: Baker Hughes Holdings LLC
•
Filing: 1978-08-09
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Granted: 1980-11-25
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Expires: 1998-08-09
Abstract
Abstract Benzazoles of the general formula ##STR1## and derivatives thereof; where X=O, S, NH and n is a number, for example 3-12 or greater, such as 3-5 or greater, and R is a substituted group, for example, a hydrocarbon or substituted hydrocarbon group, such as alkyl, etc. and n' is a number 0-3 or greater; and to use for such benzazoles as corrosion inhibitors.
Inventors
- 👤 Derek Redmore
- 👤 Benjamin T. Outlaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:21
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; C09; C09K; C09K8/00; C09K8/54; C23F11/16; C23F11/165; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
63 words
A process of inhibiting or preventing the corrosion of a metal selected from the group consisting of iron and ferrous alloys in a corrosive system which consists essentially of treating said system with a corrosion inhibiting amount of a benzazole as the sole corrosion inhibitor, said benzazole having an alkylene amino group side chain on the number 2 position on the heterocyclic moiety.
Claim 2
Dependent Claim
63 words
A process of inhibiting or preventing the corrosion of a metal selected from the group consisting of iron and ferrous alloys in a corrosive system which consists essentially of treating said system with a corrosion inhibiting amount of a benzazole as the sole corrosion inhibitor, said benzazole having an alkylene amino group side chain on the number 2 position on the heterocyclic moiety.
Claim 3
Dependent Claim
16 words
The process of claim 1 where the systems being treated are oil or gas well systems.
Claim 4
Dependent Claim
20 words
The process of claim 1 where the system is treated by first applying the corrosion inhibitor to the metal surfaces.
Claim 5
Dependent Claim
29 words
The process of claim 1 where the system is treated by dissolving the corrosion inhibitor in the corrosive medium and keeping the solution in contact with the metal surfaces.
Claim 6
Dependent Claim
17 words
The process of claim 1 where the benzazole unit is a benzimidazole, a benzoxazole, or a benzothiazole.
Claim 7
Dependent Claim
15 words
The process of claim 5 where the side chain is --CH.sub.2).sub.n NH.sub.2 where n= 3-5.
Claim 8
Dependent Claim
15 words
The process of claim 6 where the amino group is alkylated with a hydrocarbon group.
Claim 9
Dependent Claim
13 words
The process of claim 7 where the hydrocarbon group is alkyl or benzyl.
Claim 10
Dependent Claim
7 words
The process of claim 6 where n=3.
Claim 11
Dependent Claim
15 words
The process of claim 9 where the amino group is alkylated with a hydrocarbon group.
Claim 12
Dependent Claim
13 words
The process of claim 10 where the hydrocarbon group is alkyl or benzyl.
Claim 13
Dependent Claim
10 words
The process of claim 9 where the benzazole is benzothiazole.
Claim 14
Dependent Claim
15 words
The process of claim 12 where the amino group is alkylated with a hydrocarbon group.
Claim 15
Dependent Claim
13 words
The process of claim 13 where the hydrocarbon group is alkyl or benzyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |