US3969199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating aluminum with a strippable copper deposit
Assignee: Gould Inc
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Filing: 1975-07-07
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Granted: 1976-07-13
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Expires: 1995-07-07
Abstract
Abstract An improvement in providing a mechanically strippable copper plate on an aluminum carrier is achieved by pretreating the aluminum carrier with an alkaline, aqueous, alkali metal zincate composition containing a small amount of one or more water soluble iron, cobalt or nickel salts, and removing substantially all of the deposited zincate coating with acid prior to copper plating.
Inventors
- 👤 Betty L. Berdan
- 👤 Betty M. Luce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:28
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/022; H05K3/025; C; C25; C25D; C25D1/00; C25D1/04; C25D5/00; C25D5/34; C25D5/42; C25D5/44; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/01; H05K2203/0147; H05K2203/0152; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K2203/0726; H05K3/38; H05K3/382
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A method of electroplating an aluminum carrier with a mechanically strippable copper electroplate, which method comprises providing said carrier with a coating by contacting said carrier with an aqueous, alkaline solution of alkali metal zincate containing at least about 0.25 g/l of a water soluble salt of a metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof, and a complexing agent for the metal ions introduced as said water soluble salt, contacting said coated carrier with an acid to remove substantially all of said coating, and electroplating copper on the treated surfaces of said carrier.
Claim 2
Independent Claim
99 words
A method of electroplating an aluminum carrier with a mechanically strippable copper electroplate, which method comprises providing said carrier with a coating by contacting said carrier with an aqueous, alkaline solution of alkali metal zincate containing at least about 0.25 g/l of a water soluble salt of a metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof, and a complexing agent for the metal ions introduced as said water soluble salt, contacting said coated carrier with an acid to remove substantially all of said coating, and electroplating copper on the treated surfaces of said carrier.
Claim 3
Dependent Claim
34 words
The method defined in claim 1 wherein the said zincate solution further comprises a material selected from the group consisting of sodium nitrate, potassium nitrate, ammonium nitrate, sodium nitrate, potassium nitrite and ammonium nitrite.
Claim 4
Dependent Claim
14 words
The method defined in claim 2 wherein said water soluble salt is ferric chloride.
Claim 5
Dependent Claim
12 words
The method defined in claim 3 wherein said acid is nitric acid.
Claim 6
Dependent Claim
14 words
The method defined in claim 1 wherein said water soluble salt is ferric nitrate.
Claim 7
Dependent Claim
23 words
The method defined in claim 1 wherein said complexing agent is selected from the group consisting of Rochelle salt, sodium gluconate and mannitol.
Claim 8
Dependent Claim
18 words
The method defined in claim 1 wherein said copper electroplate is deposited from a pyrophosphate copper plating bath.
Claim 9
Dependent Claim
40 words
The method defined in claim 1 wherein the copper electroplate is provided with an overplate of a metal selected from the group consisting of zinc and indium to reduce the peel strength between the copper electroplate and the aluminum carrier.
Claim 10
Independent Claim
139 words
A method of providing a temporary aluminum carrier with a densely nucleated copper coating, said method comprising: contacting said carrier with an aqueous composition prepared from the following ingredients: from about 45 to about 100 g/l of an alkali metal hydroxide; from about 4.5 to about 10 g/l of zinc oxide; from about 0.5 to about 3.0 g/l of a water soluble salt of a metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof; and from about 25 to about 100 g/l of a complexing agent for metal ions introduced as said water soluble salt, thereby to form on said carrier a zincate coating; contacting said carrier with an acid to remove substantially all of the said coating, and electroplating said treated surface with copper to produce a densely nucleated copper coating on said carrier.
Claim 11
Independent Claim
139 words
A method of providing a temporary aluminum carrier with a densely nucleated copper coating, said method comprising: contacting said carrier with an aqueous composition prepared from the following ingredients: from about 45 to about 100 g/l of an alkali metal hydroxide; from about 4.5 to about 10 g/l of zinc oxide; from about 0.5 to about 3.0 g/l of a water soluble salt of a metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof; and from about 25 to about 100 g/l of a complexing agent for metal ions introduced as said water soluble salt, thereby to form on said carrier a zincate coating; contacting said carrier with an acid to remove substantially all of the said coating, and electroplating said treated surface with copper to produce a densely nucleated copper coating on said carrier.
Claim 12
Dependent Claim
30 words
The method defined in claim 9 wherein said composition comprises: Sodium hydroxide 50 g/l
Zinc Oxide 5 g/l
Ferric chloride 2 g/l
Rochelle salt 50 g/l
Sodium nitrate 1 g/l.
Claim 13
Dependent Claim
15 words
The method defined in claim 10 wherein said acid is 25 vol. % nitric acid.
Claim 14
Dependent Claim
17 words
The method defined in claim 9 wherein the electroplating step is accomplished with a pyrophosphate copper bath.
Claim 15
Dependent Claim
36 words
The method defined in claim 9 wherein the copper electroplate is overplated with a metal selected from the group consisting of zinc and indium to reduce the peel strength between the copper and the aluminum carrier.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |