US4181757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for surface coating gold alloys onto a metallic substrate to enhance corrosion protection
Assignee: Individual
•
Filing: 1978-01-17
•
Granted: 1980-01-01
•
Expires: 1998-01-17
Abstract
Abstract Processes and compositions are disclosed for surface coating of metals and alloys of low nobility with gold alloys to provide improved corrosion resistance and surface hardness to the underlying metals.
Inventors
- 👤 William V. Youdelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:50
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/08; C23C24/10; C23C24/103; C23C24/106; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A process to provide an improved surface corrosion resistance and surface hardness to a substrate composed of a metal less noble than gold, which process comprises: (a) surface coating the less noble metal substrate with a slurry composed of (i) a gold alloy powder, said gold alloy having a melting point less than 600° C., (ii) an essentially inorganic oxide-dissolving flux which becomes fully active in a temperature range of about 550° C. to 600° C. and (iii) an organic liquid; (b) firing the slurry coating to a temperature of about 540° C. and above to melt and spread the gold alloy over the surface of the less noble underlying metal substrate.
Claim 2
Dependent Claim
112 words
A process to provide an improved surface corrosion resistance and surface hardness to a substrate composed of a metal less noble than gold, which process comprises: (a) surface coating the less noble metal substrate with a slurry composed of (i) a gold alloy powder, said gold alloy having a melting point less than 600° C., (ii) an essentially inorganic oxide-dissolving flux which becomes fully active in a temperature range of about 550° C. to 600° C. and (iii) an organic liquid; (b) firing the slurry coating to a temperature of about 540° C. and above to melt and spread the gold alloy over the surface of the less noble underlying metal substrate.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein said gold alloy powder is composed of at least one of powdered binary gold alloys selected from the group consisting of gold-germanium, gold-silicon and gold-tin.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said gold alloy consists essentially of from about 8 to 16% by weight germanium and the remainder gold.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the gold alloy consists essentially of from about 3 to 9% by weight silicon and the remainder gold.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein the gold alloy consists essentially of from about 15 to 25% by weight tin and the remainder gold.
Claim 7
Dependent Claim
63 words
The process of claim 1 wherein the gold alloy powder and the oxide-dissolving flux are combined to form a powder composite containing up to 5% by weight of the oxide-dissolving flux and the remainder being gold alloy powder, the gold alloy being composed of at least one of the powdered binary gold alloys selected from the group consisting of gold-germanium, gold-silicon, and gold-tin.
Claim 8
Dependent Claim
30 words
The process of claim 1 wherein the organic liquid contains at least one of the constituents selected from the group consisting of ethylene glycol, cyclohexanol and ethyl or methyl alcohol.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein the organic liquid consists essentially of equal parts by volume of ethylene glycol, cyclohexanol and ethyl or methyl alcohol.
Claim 10
Dependent Claim
51 words
The process of claim 1 wherein the oxide-dissolving flux and organic liquid are combined to form an emulsion, the emulsion containing up to 15% by weight of the oxide-dissolving flux and the organic liquid containing at least one of the group consisting of ethylene glycol, cyclohexanol and ethyl or methyl alcohol.
Claim 11
Dependent Claim
69 words
The process of claim 1 wherein the slurry contains 5% maximum by weight of the oxide-dissolving flux, 15% maximum by weight of an organic liquid containing at least one of the constituents selected from the group consisting of ethylene glycol, cyclohexanol and ethyl or methyl alcohol and the remainder comprising at least one of a powdered binary gold alloy selected from the group consisting of gold-germanium, gold-silicon and gold-tin.
Claim 12
Dependent Claim
23 words
The process of claim 1 wherein the inorganic oxide-dissolving flux is composed principally of borates, carbonates, fluorides and chlorides of the alkali metals.
References Cited (Backward Citations)
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US3199189A
Cited
US3367756A
Cited
US3574610A
Cited
US3684533A
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US3901693A
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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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |