US3880730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-galvanic gold plating process
Assignee: United States Atomic Energy Commission
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Filing: 1974-03-21
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Granted: 1975-04-29
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Expires: 1994-03-21
Abstract
Abstract A gold plating arrangement is described which consists essentially of a plating bath consisting of 0.5 to 10 grams per liter lithium or potassium aurocyanide and 15 to 150 grams per liter ammonium chloride dissolved in water, and a base metal in contact with a second metal which occupies a higher position in the EMF series than gold or said base metal. The resultant plate is much denser than that obtainable by conventional electrolytic plating, thus serving as an effective corrosion protective surface against acid media.
Inventors
- 👤 Ralph R Wright
- 👤 Calvin C Wright
- 👤 George S Petit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:43
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/48
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A METHOD FOR DEPOSITING METALLIC ARTICLES WITH GOLD WHICH COMPRISING IMMERSING SAID ARTICLE IN A PLATING BATH MAINTAINED AT A TEMPERATURE IN THE RANGE 90*-100*C AND AT A PH IN THE RANGE 4.5-6.5 SAID BATH CONSISTING ESSENTIALLY OF 0.5 TO 10 GRAMS/LITER LITHIUM OR POTASSIUM AUROCYANIDE AND 15-150 GRAMS/LITER AMMONIUM CHLORIDE, WHILE SAID ARTICLE IS IN ELECTRICAL CONTACT WITH A DISSIMILAR METAL WHICH RENDERS THE ARTICLE CATHODIC IN SAID BATH.
Claim 2
Independent Claim
70 words
A METHOD FOR DEPOSITING METALLIC ARTICLES WITH GOLD WHICH COMPRISING IMMERSING SAID ARTICLE IN A PLATING BATH MAINTAINED AT A TEMPERATURE IN THE RANGE 90*-100*C AND AT A PH IN THE RANGE 4.5-6.5 SAID BATH CONSISTING ESSENTIALLY OF 0.5 TO 10 GRAMS/LITER LITHIUM OR POTASSIUM AUROCYANIDE AND 15-150 GRAMS/LITER AMMONIUM CHLORIDE, WHILE SAID ARTICLE IS IN ELECTRICAL CONTACT WITH A DISSIMILAR METAL WHICH RENDERS THE ARTICLE CATHODIC IN SAID BATH.
Claim 3
Dependent Claim
30 words
The method according to claIm 1 in which the pH of the bath is maintained within the range 4.5-6.5 by addition of either HCl-NH4Cl mixture or a mixture of NH4OH-NH4Cl.
Claim 4
Dependent Claim
25 words
The method according to claim 1 in which the dissimilar metal occupies a higher position in the electromotive series than gold or the metal article.
References Cited (Backward Citations)
US2791556A
Cited
US3389060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |