Patent US4082908A successfully refreshed from Google Patents.
US4082908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gold plating process and product produced thereby
Assignee: Texas Instruments Tucson Corp
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Filing: 1976-05-05
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Granted: 1978-04-04
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Expires: 1996-05-05
Abstract
Abstract An electroless gold plating process in which the workpiece to be plated has a nickel coating, the process resulting in formation of a nickel/gold alloy that exhibits the majority of the physical characteristics exhibited by pure gold plating.
Inventors
- 👤 John J. Vanaglash, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:15
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12889; Y10T428/12944
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
A metal plating process independent of application of electrical power to the workpiece comprising the steps of: a. providing a workpiece having a nickel based finish, said finish being at least 85% by weight nickel; and b. treating said workpiece with a bath comprising a plating source component and a buffering component, said plating source component comprising one or more gold containing compounds wherein said gold is capable of alloying with said nickel of said nickel based finish, said treating being conducted for a time and at a temperature sufficient to provide a layer on said workpiece, said layer comprising an alloy of nickel and gold, said layer having a molecular ratio of nickel to gold of from 1:1 to 6:1, and wherein the source of said nickel in said layer is the nickel from said nickel based finish.
Claim 2
Dependent Claim
139 words
A metal plating process independent of application of electrical power to the workpiece comprising the steps of: a. providing a workpiece having a nickel based finish, said finish being at least 85% by weight nickel; and b. treating said workpiece with a bath comprising a plating source component and a buffering component, said plating source component comprising one or more gold containing compounds wherein said gold is capable of alloying with said nickel of said nickel based finish, said treating being conducted for a time and at a temperature sufficient to provide a layer on said workpiece, said layer comprising an alloy of nickel and gold, said layer having a molecular ratio of nickel to gold of from 1:1 to 6:1, and wherein the source of said nickel in said layer is the nickel from said nickel based finish.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said nickel is at least 99% by weight pure.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said bath is an aqueous bath.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said gold containing compound is a monovalent gold compound.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein at least one of said gold containing compounds is potassium gold cyanide.
Claim 7
Dependent Claim
72 words
The process of claim 1 wherein said gold containing compound is present to the extent of about 1 × 10 -5 to 10 × 10 -5 moles per liter per square inch of surface of said nickel based finish and said buffering compound is present to the extent of about 3 × 10 -4 to 4 × 10 -3 moles per liter per square inch of surface of said nickel based finish.
Claim 8
Dependent Claim
38 words
The process of claim 1 wherein said buffering component comprises at least one member of the group consisting of a mixture of sodium bicarbonate and ammonium hydroxide, ammonium bifluoride, and a water soluble salt of a carboxylic acid.
Claim 9
Dependent Claim
37 words
The process of claim 1 wherein said nickel based finish comprises nickel and at least one member of the group consisting of cobalt, boron, and phosphorus, provided that said phosphorus does not exceed about 6% by weight.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein said buffering component forms a water soluble nickel complex.
Claim 11
Dependent Claim
16 words
A workpiece having a nickel based finish treated in accordance with the process of claim 1.
Claim 12
Dependent Claim
16 words
A workpiece having a nickel based finish treated in accordance with the process of claim 8.
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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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |