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Patent US4763729A successfully refreshed from Google Patents.
US4763729A
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Method for inhibiting corrosion of iron-containing alloy articles in sulfur-containing media
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1987-05-11
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Granted: 1988-08-16
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Expires: 2007-05-11
Abstract
Abstract Corrosion of iron-containing alloy articles is inhibited by forming on the articles a corrosion resistant layer containing atoms of a refractory metal.
Inventors
- 👤 Trikur A. Ramanarayanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:16
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C09; C09K; C09K8/00; C09K8/54; C23C22/00; C23C22/05; C23C22/06; C23C22/40; C23C30/00; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/185; Y; Y10; Y10S; Y10S166/00; Y10S166/902; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
66 words
A method for inhibiting corrosion of an iron-containing alloy article in a sulfur compound-containing corrosive medium, said method comprising forming on said article a corrosion resistant sulfide layer containing atoms of a refractory metal of Group IV B or Group V B of the periodic system by introducing into said corrosive medium an amount sufficient to form said layer of an oxysalt of said refractory metal.
Claim 2
Independent Claim
66 words
A method for inhibiting corrosion of an iron-containing alloy article in a sulfur compound-containing corrosive medium, said method comprising forming on said article a corrosion resistant sulfide layer containing atoms of a refractory metal of Group IV B or Group V B of the periodic system by introducing into said corrosive medium an amount sufficient to form said layer of an oxysalt of said refractory metal.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said iron-containing alloy is steel.
Claim 4
Dependent Claim
11 words
The method of claim 2 wherein said steel is carbon steel.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein said oxysalt is selected from the group consisting of metavanadate, orthovanadate and pyrovanadate.
Claim 6
Dependent Claim
10 words
The method of claim 1 wherein said oxysalt is metavanadate.
Claim 7
Dependent Claim
10 words
The method of claim 1 wherein said oxysalt is orthovanadate.
Claim 8
Dependent Claim
10 words
The method of claim 1 wherein said oxysalt is pyrovanadate.
Claim 9
Dependent Claim
17 words
The method of claim 5 or claim 6 or claim 7 wherein said iron-containing alloy is steel.
Claim 10
Dependent Claim
17 words
The method of claim 5 or claim 6 or claim 7 wherein said steel is carbon steel.
Claim 11
Independent Claim
94 words
A method for inhibiting corrosion of an iron-containing tubular article situated in a well and through which gas or oil is extracted from the well and said tubular article having an interior portion in contact with a sulfur compound-containing corrosive medium containing hydrogen sulfide, said method comprising forming on said article a corrosion resistant sulfide layer containing atoms of a refractory metal of Group IV B or Group V B of the periodic system by introducing into said corrosive medium an amount sufficient to form said layers of an oxysalt of said refractory metal.
Claim 12
Independent Claim
94 words
A method for inhibiting corrosion of an iron-containing tubular article situated in a well and through which gas or oil is extracted from the well and said tubular article having an interior portion in contact with a sulfur compound-containing corrosive medium containing hydrogen sulfide, said method comprising forming on said article a corrosion resistant sulfide layer containing atoms of a refractory metal of Group IV B or Group V B of the periodic system by introducing into said corrosive medium an amount sufficient to form said layers of an oxysalt of said refractory metal.
Claim 13
Dependent Claim
11 words
The method of claim 10 wherein said iron-containing alloy is steel.
Claim 14
Dependent Claim
19 words
The method of claim 10 wherein said oxysalt is selected from the group consisting of metavanadate, orthovanadate and pyrovanadate.
Claim 15
Dependent Claim
10 words
The method of claim 10 wherein said oxysalt is metavanadate.
Claim 16
Dependent Claim
10 words
The method of claim 10 wherein said oxysalt is orthovanadate.
Claim 17
Dependent Claim
10 words
The method of claim 10 wherein said oxysalt is pyrovanadate.
References Cited (Backward Citations)
US3928211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |