Patent US4820591A successfully refreshed from Google Patents.
US4820591A
Expired / Lapsed
US
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Corrosion resistant article and method of manufacture
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1987-05-11
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Granted: 1989-04-11
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Expires: 2007-05-11
Abstract
Abstract A corrosion resistant article comprising a refractory metal having a sulfide coating of said refractory metal formed thereon and a method for producing the same by forming on a refractory metal substrate a sulfide coating of said refractory metal. The corrosion resistant article may be provided in a composite comprising also a metal substrate.
Inventors
- 👤 Trikur A. Ramanarayanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:18
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/02; C23C26/00; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; Y; Y10; Y10S; Y10S166/00; Y10S166/902; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/12771; Y10T428/12806; Y10T428/12812; Y10T428/12861; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
31 words
A composite, corrosion-resistant article comprising a metal substrate, a layer of a refractory metal on said substrate and a sulfide coating of said refractory metal formed on said refractory metal layer.
Claim 2
Dependent Claim
31 words
A composite, corrosion-resistant article comprising a metal substrate, a layer of a refractory metal on said substrate and a sulfide coating of said refractory metal formed on said refractory metal layer.
Claim 3
Dependent Claim
13 words
The article of claim 1 wherein said metal substrate is an iron-base alloy.
Claim 4
Dependent Claim
12 words
The article of claim 2 wherein said metal substrate is carbon steel.
Claim 5
Dependent Claim
29 words
The article of claim 2 or claim 3 wherein said refractory metal is selected from the group consisting of niobium, tantalum, molybdenum, tungsten, titanium, zirconium, hafnium, vanadium and chromium.
Claim 6
Dependent Claim
22 words
The article of claim 4 in the form of tubing with said sulfide coating being on an interior portion of said tubing.
Claim 7
Dependent Claim
16 words
The article of claim 4 wherein said refractory metal layer is metallurgically bonded to said substrate.
Claim 8
Independent Claim
32 words
A method for producing a composite, corrosion-resistant article comprising providing a layer of a refractory metal on a metal substrate and forming a sulfide coating of said refractory metal on said layer.
Claim 9
Independent Claim
32 words
A method for producing a composite, corrosion-resistant article comprising providing a layer of a refractory metal on a metal substrate and forming a sulfide coating of said refractory metal on said layer.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein said metal substrate is an iron-base alloy.
Claim 11
Dependent Claim
12 words
The method of claim 8 wherein said metal substrate is carbon steel.
Claim 12
Dependent Claim
29 words
The method of claim 8 or claim 9 wherein said refractory metal is selected from the group consisting of niobium, tantalum, molybdenum, tungsten, titanium, zirconium, hafnium, vanadium and chromium.
Claim 13
Dependent Claim
25 words
The method of claim 10 wherein said article is formed into a tubing with said sulfide coating being on an interior portion of said tubing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |