US4431707A
Expired / Lapsed
US
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Plating anodized aluminum substrates
Assignee: International Business Machines Corp
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Filing: 1982-12-27
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Granted: 1984-02-14
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Expires: 2002-12-27
Abstract
Abstract Nickel and copper are plated over a thick anodic coating on an aluminum substrate as a step in the manufacture of printed circuit board substrates.
Inventors
- 👤 Richard W. Burns
- 👤 Issa S. Mahmoud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:52
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; C25D5/42; C25D5/44; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1633; C23C18/1646; C23C18/165; C23C18/1653; C23C18/18; C23C18/1851; C23C18/1872; C23C18/1886; C23C18/1889; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/053; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K2203/00; H05K2203/03; H05K2203/0315; H05K2203/11; H05K2203/1147; Y; Y10; Y10S; Y10S205/00; Y10S205/917; Y10S205/92; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12611; Y10T428/12708; Y10T428/12722; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
A method of preparing aluminum work pieces having sealed, thick anodic coatings thereon, for plating including the following steps: sensitizing the surface of the work piece in a solution of SnCl 2 and HCl; and activating said surface in a solution containing PdCl 2 and HCl.
Claim 2
Independent Claim
46 words
A method of preparing aluminum work pieces having sealed, thick anodic coatings thereon, for plating including the following steps: sensitizing the surface of the work piece in a solution of SnCl 2 and HCl; and activating said surface in a solution containing PdCl 2 and HCl.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein the surface is also etched by said solution during said sensitizing step, the sensitizing step is also an etching step, occurring in a solution comprising SnCl 2 and HCl.
Claim 4
Dependent Claim
33 words
The method of claim 2 wherein said sensitizing and etching solution has 40 g per liter of stannous chloride and 60 mililiters per liter of 36% hydrochloric acid in 1 liter of water.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the activating step solution contains 0.25 g PdCl 2 per 2.5 mililiters of 36% hydrochloric acid.
Claim 6
Independent Claim
34 words
A method of preparing aluminum substrates for utilization as printed circuit board substrates comprising the following steps: (a) hard anodizing; (b) sealing; (c) sensitizing and etching; (d) rinsing; (e) activating; (f) rinsing; (g) plating.
Claim 7
Independent Claim
34 words
A method of preparing aluminum substrates for utilization as printed circuit board substrates comprising the following steps: (a) hard anodizing; (b) sealing; (c) sensitizing and etching; (d) rinsing; (e) activating; (f) rinsing; (g) plating.
Claim 8
Dependent Claim
15 words
A substrate for printed circuit boards made in accordance with the method of claim 5.
Claim 9
Dependent Claim
22 words
The method of claim 5 wherein the sensitizing and etching step occurs in a solution comprising stannous chloride, hydrochloric acid and water.
Claim 10
Dependent Claim
19 words
The method of claim 5 wherein the activating step occurs in a solution of palladium chloride and hydrochloric acid.
Claim 11
Dependent Claim
33 words
The method of claim 5 wherein plating step is done in two stages comprising: first, electrolessly plating in a nickel bath for 5-10 minutes and then electrolytically plating in an acidified copper bath.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |