Patent US3963455A successfully refreshed from Google Patents.
US3963455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposited gold plating
Assignee: Shipley Co Inc
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Filing: 1975-02-26
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Granted: 1976-06-15
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Expires: 1995-02-26
Abstract
Abstract The method of preventing or inhibiting diffusion of a base metal into an electrodeposited gold layer on said base metal which comprises electrodepositing a barrier layer on the base metal comprising a tungsten-cobalt alloy or a tungsten-nickel alloy and subsequently electrodepositing gold on the alloy barrier layer. The invention also includes the use of chelating agents in tungsten-cobalt and tungsten-nickel plating baths.
Inventors
- 👤 Fred I. Nobel
- 👤 Barnet D. Ostrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/10; C25D5/627; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/12861; Y10T428/12889; Y10T428/12931
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
91 words
A base metal or base-metal alloy having a tungsten alloyed barrier coating electrodeposited thereon and an electrodeposited gold or gold alloy plating on said barrier coating, wherein the metal alloyed with tungsten is cobalt or nickel and is alloyed therewith in an amount that will affect the electrodeposition of the tungsten in alloyed form on the base metal and containing a sufficient amount of tungsten to significantly inhibit diffusion of the base metal or base-metal alloy into the gold layer electrodeposited thereon at a thickenss of less than about 50 microinches.
Claim 2
Dependent Claim
91 words
A base metal or base-metal alloy having a tungsten alloyed barrier coating electrodeposited thereon and an electrodeposited gold or gold alloy plating on said barrier coating, wherein the metal alloyed with tungsten is cobalt or nickel and is alloyed therewith in an amount that will affect the electrodeposition of the tungsten in alloyed form on the base metal and containing a sufficient amount of tungsten to significantly inhibit diffusion of the base metal or base-metal alloy into the gold layer electrodeposited thereon at a thickenss of less than about 50 microinches.
Claim 3
Dependent Claim
19 words
The product of claim 1 in which the tungsten alloyed barrier coating contains at least about 40 percent tungsten.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |