US3862850A
Expired / Lapsed
US
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Electroless gold plating on refractory metals
Assignee: National Beryllia Corp
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Filing: 1973-06-08
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Granted: 1975-01-28
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Expires: 1993-06-08
Abstract
Abstract For the electroless gold plating of metals, including refractory metals such as molybdenum, tungsten, columbium, and cobalt, a process is provided which includes activating the metal with an alkaline descaler followed by a dilute acid, and immersing the metal in a plating bath which is composed of a soluble gold salt, an organic chelating compound, a non-ammoniacal organic buffering and complexing agent, and a non-ammoniacal alkali hydroxide.
Inventors
- 👤 Richard Kent Trueblood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:54
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; C25; C25D; C25D3/00; C25D3/02; C25D3/48; C25D5/00; C25D5/34; C25D5/38; H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K3/00; H05K3/22; H05K3/24; H05K3/245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
A method as in claim 1 wherein the step of rinsing the metal in a dilute acid comprises the step of rinsing the metal in a hydrochloric acid solution in the range of 20-50 vol. percent.
Claim 2
Dependent Claim
66 words
A method as in claim 1 wherein the step of immersing the metal in an electroless gold plating bath including a non-ammoniacal alkali metal salt of a weak acid comprises the step of immersing the metal in an electroless gold plating bath including a non-ammoniacal alkali metal salt of a weak acid selected from the group consisting of sodium potassium tartrate, sodium citrate, and potassium citrate.
Claim 3
Dependent Claim
55 words
A method as in claim 1 wherein the step of immersing the metal in an electroless gold plating bath including a non-ammoniacal alkali metal hydroxide comprises the step of immersing the metal in an electroless gold plating bath including a non-ammoniacal alkali metal hydroxide selected from the group consisting of sodium hydroxide and potassium hydroxide.
Claim 4
Dependent Claim
55 words
A method as in claim 1 wherein the step of immersing the metal in an electroless gold plating bath including an organic chelating compound comprises the step of immersing the metal in an electroless gold plating bath including an organic chelating compound selected from the group consisting of tetra sodium ethylenediaminetetraacetate tetrahydrate, ethylenediamine, and triethanolamine.
Claim 5
Dependent Claim
42 words
A method as in claim 1 wherein the step of immersing the metal in an electroless gold plating bath comprises the step of immersing the metal in an electroless gold plating bath whose temperature is the boiling point temperature of said bath.
References Cited (Backward Citations)
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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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |