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US3864222A
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Baths for Electrodeposition of Gold and Gold Alloys and Method Therefore
Assignee: Technic Inc
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Filing: 1973-03-26
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Granted: 1975-02-04
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Expires: 1993-03-26
Abstract
Abstract Polyethyleneimines, derived from the polymerization of ethylene imines, substituted ethylene imines, or derived from the addition of ethylene imine to organic or inorganic molecules, are incorporated into gold and gold alloy plating baths as agents for the general improvement of the brightness of the electroplate and other physical properties of both the deposit obtained in the electroplating from such baths and of the operating conditions of the baths. The operating characteristics of the aqueous electroplating baths such as the maximum current density, the cathode current efficiency, the width of the pH range etc. are vastly improved over conventional plating baths. Furthermore, the incorporation of these polyethylene imines also results in minimizing the stress of the electrodeposit and in minimizing the variation of the stress with current density.
Inventors
- 👤 William A Wilson
- 👤 Hana M Hradil
- 👤 Edward F Hradil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:52
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/62; C25D3/48
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
19 words
A bath in accordance with claim 1 wherein the gold is present in solution as the potassium gold cyanide.
Claim 2
Dependent Claim
26 words
A bath in accordance with claim 2 wherein the imine compound has a molecular weight of about 600 present in solution with the potassium gold cyanide.
Claim 3
Dependent Claim
19 words
A bath in accordance with claim 1 wherein the gold is present in solution as a complex gold sulfite.
Claim 4
Dependent Claim
26 words
A bath in accordance with claim 4 wherein the imine compound has a molecular weight of about 600 present in solution with a complex gold sulfite.
Claim 5
Dependent Claim
20 words
A bath in accordance with claim 1 wherein the gold is present in the solution as a sodium gold cyanide.
Claim 6
Dependent Claim
18 words
A bath in accordance with claim 6 wherein the imine compound has a molecular weight of about 600.
Claim 7
Dependent Claim
21 words
A bath in accordance with claim 1 wherein the gold is present in the solution as a complex ammonium gold cyanide.
Claim 8
Dependent Claim
15 words
A bath in accordance with claim 1 wherein the solution contains a phosphinic acid agent.
Claim 9
Dependent Claim
15 words
A bath in accordance with claim 1 wherein the solution contains a phosphinic-carboxylic acid agent.
Claim 10
Dependent Claim
15 words
A bath in accordance with claim 1 wherein the solution contains a phosphonic-carboxylic acid agent.
Claim 11
Dependent Claim
18 words
A bath in accordance with claim 2 in which the bath contains a cobalt and/or nickel chelate compound.
Claim 12
Dependent Claim
14 words
A bath in accordance with claim 1 in which the bath contains a polyamine.
Claim 13
Independent Claim
187 words
The method of electroplating gold or gold alloy to form a bright hard deposit which comprises in an aqueous bath for the electrodeposition of gold having gold present therein as cyanide or sulfite in solution in a concentration in the range from grams per liter of gold to saturation and an alloying metal as a salt in an amount from 0 to 20 grams of metal per liter of solution incorporating in said solution an imine compound selected from the group consisting of polyethylene imines derived from polymerization of ethylene imine; ethylene imine and substituted ethylene imine and imines derived from addition of ethylene imine to organic or inorganic molecules, said imine compound being incorporated in amount from 0.005 to 100 grams per liter and having a molecular weight in the range 100 to 60,000 and electroplating gold or gold base alloy from said solution onto a base metal while maintaining the pH of the solution in the range from about 1 to 14 and employing a current density of 1/2 to 100 amperes per square foot at a temperature in the range from 20*C to 90*C.
Claim 14
Dependent Claim
24 words
The method in accordance with claim 14 in which the alloy metal is silver and a silver-gold alloy is deposited on flatware and hollowware.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |