US4792469A
Expired / Lapsed
US
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Electroless gold plating solution
Assignee: C Uyemura & Co Ltd
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Filing: 1986-10-24
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Granted: 1988-12-20
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Expires: 2006-10-24
Abstract
Abstract An amine, such as a triethanol amine or ethylenediamine is added to an alkaline electroless gold plating solution comprising a gold salt and a boron-based reducing agent to deposit a gold film having good appearance and high throwing power on a workpiece at a high deposition rate.
Inventors
- 👤 Masahiro Saito
- 👤 Hideyuki Takami
- 👤 Makoto Sato
- 👤 Masayuki Kiso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:26
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; C23C18/44
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
55 words
An alkaline electroless gold plating solution comprising: a gold salt, an amine borane reducing agent, an amine compound in an amount of from 10 to 200 ml/liter, elemental lead from a lead salt in an amount of from 0.1 to 100 ppm, and an alkaline hydroxide in an amount of from 10 to 100 grams/liter.
Claim 2
Dependent Claim
55 words
An alkaline electroless gold plating solution comprising: a gold salt, an amine borane reducing agent, an amine compound in an amount of from 10 to 200 ml/liter, elemental lead from a lead salt in an amount of from 0.1 to 100 ppm, and an alkaline hydroxide in an amount of from 10 to 100 grams/liter.
Claim 3
Dependent Claim
24 words
The gold plating solution as defined in claim 1, wherein said amine compound is selected from the group consisting of trialkonal amines and ethyleneamines.
Claim 4
Dependent Claim
60 words
The alkaline electroless gold plating solution as defined in claim 2, wherein said gold salt contains elemental gold in an amount of from 1 to 10 grams/liter, said amine borane reducing agent is in an amount of from 1 to 20 grams/liter, and said elemental lead from a lead salt is in an amount of from 10 to 100 ppm.
Claim 5
Dependent Claim
27 words
The alkaline electroless gold plating solution as defined in claim 3, wherein said solution further comprises a cyanide in an amount of from 1 to 20 grams/liter.
Claim 6
Dependent Claim
26 words
The alkaline electroless gold plating solution as defined in claim 4, wherein said amine compound is selected from the gorup consisting of triethanol amine and ethylenediamine.
Claim 7
Dependent Claim
47 words
The alkaline electroless gold plating solution as defined in claim 5, wherein said amine borane reducing agent is dimethylamine borane, said amine compound is in an amount of from 10 to 100 ml/liter and said alkaline hydroxide is in an amount of from 10 to 60 grams/liter.
Claim 8
Dependent Claim
42 words
The alkaline electroless gold plating solution as defined in claim 6, wherein said amine compound is an amount of from 10 to 50 ml/liter, and said elemental lead from a lead salt is in an amount of from 10 to 50 ppm.
Claim 9
Dependent Claim
18 words
The alkaline electroless gold plating solution as defined in claim 6, wherein said amine compound is triethanol amine.
Claim 10
Dependent Claim
17 words
The alkaline electroless gold plating solution as defined in claim 6, wherein said amine compound is ethylenediamine.
Claim 11
Independent Claim
119 words
A method of electroless gold plating which comprises: conducting electroless gold plating on a workpiece by using an alkaline electroless gold plating solution comprising, elemental gold to form a gold salt in an amount of from 1 to 10 grams/liter, an amine borane reducing agent in an amount of from 1 to 20 grams/liter, an amine compound selected from the group consisting of trialkonal amines and ethyleneamines, elemental lead from a lead salt in an amount of from 10 to 100 ppm, and an alkaline hydroxide in an amount of from 10 to 100 grams/liter, wherein a gold plated film having a lemon yellow appearance and high throwing power is obtained on said workpiece at a high deposition rate.
Claim 12
Independent Claim
119 words
A method of electroless gold plating which comprises: conducting electroless gold plating on a workpiece by using an alkaline electroless gold plating solution comprising, elemental gold to form a gold salt in an amount of from 1 to 10 grams/liter, an amine borane reducing agent in an amount of from 1 to 20 grams/liter, an amine compound selected from the group consisting of trialkonal amines and ethyleneamines, elemental lead from a lead salt in an amount of from 10 to 100 ppm, and an alkaline hydroxide in an amount of from 10 to 100 grams/liter, wherein a gold plated film having a lemon yellow appearance and high throwing power is obtained on said workpiece at a high deposition rate.
Claim 13
Dependent Claim
41 words
The method as defined in claim 10, wherein said alkaline electroless gold plating solution further comprises a cyanide in an amount of 1 to 20 grams/liter and said amine compound is selected from the group consisting of triethanol amine and ethylenediamine.
Claim 14
Dependent Claim
43 words
The method as defined in claim 11, wherein said amine borane reducing agent is dimethylamine borane, said amine compound is in an amount of from 10 to 100 ml/liter, and said alkaline hydroxide is in an amount of from 10 to 60 grams/liter.
Claim 15
Dependent Claim
37 words
The method as defined in claim 12, wherein said amine compound is an amount of from 10 to 50 ml/liter, and said elemental lead from a lead salt in an amount of from 10 to 50 ppm.
Claim 16
Dependent Claim
14 words
The method as defined in claim 12, wherein said amine compound is triethanol amine.
Claim 17
Dependent Claim
13 words
The method as defined in claim 12, wherein said amine compound is ethylenediamine.
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) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |