US3870619A
Expired / Lapsed
US
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Process for producing bright electrodeposits of gold and its alloys
Assignee: Technic Inc
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Filing: 1973-01-29
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Granted: 1975-03-11
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Expires: 1993-01-29
Abstract
Abstract This invention discloses a process for producing bright electrodeposits of gold or gold alloys from solutions containing aminomethylene phosphinic acids.
Inventors
- 👤 Alfred M Weisberg
- 👤 Florence P Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:56
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/48; C25D3/56; C25D3/62
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
71 words
IN AN ELECTROPLATING BATH FOR PRODUCING BRIGHT GOLD OR GOLD-BASE ALLOY DEPOSITS, IN A PH RANGE BETWEEN 3.7 AND 6.6, FROM AN AQUEOUS SOLUTION CONTAINING AS THE GOLD SOURCE, A WATER SOLUBLE GOLD CYANIDE, THE IMPROVEMENT COMPRISING, INCLUDING A SMALL BUT USEFUL AMOUNT IN THE RANGE FROM ABOUT 0.5 GRAM TO 400 GRAMS PER LITER OF A CHELATING AGENT SELECTED FROM THE GROUP CONSISTING OF THOSE COMPOUNDS REPRESENTED BY THE FORMULA;
Claim 2
Dependent Claim
71 words
IN AN ELECTROPLATING BATH FOR PRODUCING BRIGHT GOLD OR GOLD-BASE ALLOY DEPOSITS, IN A PH RANGE BETWEEN 3.7 AND 6.6, FROM AN AQUEOUS SOLUTION CONTAINING AS THE GOLD SOURCE, A WATER SOLUBLE GOLD CYANIDE, THE IMPROVEMENT COMPRISING, INCLUDING A SMALL BUT USEFUL AMOUNT IN THE RANGE FROM ABOUT 0.5 GRAM TO 400 GRAMS PER LITER OF A CHELATING AGENT SELECTED FROM THE GROUP CONSISTING OF THOSE COMPOUNDS REPRESENTED BY THE FORMULA;
Claim 3
Dependent Claim
5 words
a water soluble gold cyanide,
Claim 4
Dependent Claim
5 words
a water soluble gold cyanide,
Claim 5
Dependent Claim
5 words
a water soluble gold cyanide
Claim 6
Dependent Claim
5 words
a water soluble gold cyanide
Claim 7
Dependent Claim
71 words
In an electroplating bath for producing bright gold or gold-base alloy deposits, in a pH range between 3.7 and 6.6, from an aqueous solution containing as the gold source, a water soluble gold cyanide, the improvement comprising, including a small but useful amount in the range from about 0.5 gram to 400 grams per liter of a chelating agent selected from the group consisting of those compounds represented by the formula;
Claim 8
Dependent Claim
71 words
In an electroplating bath for producing bright gold or gold-base alloy deposits, in a pH range between 3.7 and 6.6, from an aqueous solution containing as the gold source, a water soluble gold cyanide, the improvement comprising, including a small but useful amount in the range from about 0.5 gram to 400 grams per liter of a chelating agent selected from the group consisting of those compounds represented by the formula;
Claim 9
Dependent Claim
26 words
An electroplating bath in accordance with claim 1 for producing bright gold deposits in a pH range of 3.7 to 6.6, from an aqueous solution containing
Claim 10
Dependent Claim
17 words
a salt of an alloy metal in amount up to 25 grams per liter of alloy metal
Claim 11
Dependent Claim
17 words
a salt of an alloy metal in amount up to 25 grams per liter of alloy metal
Claim 12
Dependent Claim
28 words
an organic or inorganic acid or alkali metal salt selected from the group citric, malic, phosphate, polyphosphate, sulfamate, fluoborate in amount from 10 to 150 grams per liter
Claim 13
Dependent Claim
28 words
an organic or inorganic acid or alkali metal salt selected from the group citric, malic, phosphate, polyphosphate, sulfamate, fluoborate in amount from 10 to 150 grams per liter
Claim 14
Dependent Claim
24 words
An electroplating bath for producing bright gold or gold-base alloy deposits, in a pH range between 3.7 and 6.6, from an aqueous solution containing
Claim 15
Dependent Claim
24 words
An electroplating bath for producing bright gold or gold-base alloy deposits, in a pH range between 3.7 and 6.6, from an aqueous solution containing
Claim 16
Dependent Claim
11 words
0.5 to 150 grams per liter of ethylenediamine tetra-methylene phosphinic acid.
Claim 17
Dependent Claim
11 words
0.5 to 150 grams per liter of ethylenediamine tetra-methylene phosphinic acid.
Claim 18
Dependent Claim
30 words
an organic acid or inorganic acid, or alkali metal salt selected from the group citric, malic, phosphate, polyphosphate, sulfamate, fluoborate, in amount from 10 to 150 grams per liter, and
Claim 19
Dependent Claim
30 words
an organic acid or inorganic acid, or alkali metal salt selected from the group citric, malic, phosphate, polyphosphate, sulfamate, fluoborate, in amount from 10 to 150 grams per liter, and
Claim 20
Dependent Claim
30 words
A bath in accordance with claim 3 wherein the bath contains a cobalt salt as a source of alloying metal in the amount of 0.01 to 25 grams per liter.
Claim 21
Dependent Claim
10 words
0.5 to 150 grams per liter of nitrilotrimethylene phosphinic acid.
Claim 22
Dependent Claim
10 words
0.5 to 150 grams per liter of nitrilotrimethylene phosphinic acid.
Claim 23
Dependent Claim
30 words
A bath in accordance with claim 3 wherein the bath contains a nickel salt as a source of alloying metal in the amount of 0.01 to 25 grams per liter.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |