Patent US4519840A successfully refreshed from Google Patents.
US4519840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength, wear and corrosion resistant coatings
Assignee: Praxair ST Technology Inc
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Filing: 1983-10-28
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Granted: 1985-05-28
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Expires: 2003-10-28
Abstract
Abstract A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.
Inventors
- 👤 John E. Jackson
- 👤 Thomas A. Adler
- 👤 Jean M. Quets
- 👤 Robert C. Tucker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:04
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/04; C22C29/00; C22C29/02; C22C29/06; C22C29/08; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/067; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
47 words
A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.
Claim 2
Dependent Claim
47 words
A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.
Claim 3
Dependent Claim
41 words
A coating composition according to claim 1 consisting essentially of from about 14.0 to about 18.0 weight percent cobalt, from about 2.0 to about 5.5 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.
Claim 4
Dependent Claim
34 words
A coating composition according to claim 1 having a mechanical strength sufficient to withstand an hydraulic pressure in excess of about 20,000 pounds per square inch at a coating thickness of about 0.006 inch.
Claim 5
Dependent Claim
18 words
A coating composition according to claim 1 having a hardness value in excess of 900 DPH 300 .
Claim 6
Dependent Claim
56 words
A coating composition according to claim 1 wherein the substrate is a metallic material selected from the group consisting of steel, stainless steel, iron base alloys, nickel, nickel base alloys, cobalt, cobalt base alloys, chromium, chromium base alloys, titanium, titanium base alloys, aluminum, aluminum base alloys, copper, copper base alloys, refractory metals, and refractory-metal base alloys.
Claim 7
Dependent Claim
24 words
A coating composition according to claim 1 wherein the substrate is a non-metallic material selected from the group consisting of carbon, graphite and polymers.
Claim 8
Dependent Claim
56 words
A powdered coating composition for applying a high strength, wear and corrosion resistant coating onto a substrate by a thermal spray process consisting essentially of from about 11.5 to about 14.5 weight percent cobalt, from about 1.5 to about 5.5 weight percent chromium, from about 4.0 to about 5.5 weight percent carbon and the balance tungsten.
Claim 9
Dependent Claim
56 words
A powdered coating composition for applying a high strength, wear and corrosion resistant coating onto a substrate by a thermal spray process consisting essentially of from about 11.5 to about 14.5 weight percent cobalt, from about 1.5 to about 5.5 weight percent chromium, from about 4.0 to about 5.5 weight percent carbon and the balance tungsten.
Claim 10
Dependent Claim
14 words
A powdered coating composition according to claim 7 consisting of cast and crushed powders.
Claim 11
Dependent Claim
52 words
An article comprising a substrate and a coating applied to said substrate by a thermal spray process, said coating consisting essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten.
Claim 12
Dependent Claim
52 words
An article comprising a substrate and a coating applied to said substrate by a thermal spray process, said coating consisting essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten.
Claim 13
Dependent Claim
43 words
An article according to claim 9 wherein said coating consists essentially of from about 14.0 to about 18.0 weight percent cobalt, from about 2.0 to about 5.5 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.
Claim 14
Dependent Claim
94 words
An article comprising a substrate and a coating applied to said substrate by a thermal spray process, wherein said coating consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten, and wherein said coating has a hardness value in excess of 900 DPH 300 and a mechanical strength sufficient to withstand an hydraulic pressure in excess of about 20,000 pounds per square inch at a coating thickness of about 0.006 inch.
Claim 15
Dependent Claim
94 words
An article comprising a substrate and a coating applied to said substrate by a thermal spray process, wherein said coating consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten, and wherein said coating has a hardness value in excess of 900 DPH 300 and a mechanical strength sufficient to withstand an hydraulic pressure in excess of about 20,000 pounds per square inch at a coating thickness of about 0.006 inch.
Claim 16
Dependent Claim
30 words
An article according to claim 11 wherein the major phase of said coating comprises W 2 C and wherein at least one minor phase of said coating comprises cubic WC.
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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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |