Patent US4358479A successfully refreshed from Google Patents.
US4358479A
Expired / Lapsed
US
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Treatment of copper and use thereof
Assignee: International Business Machines Corp
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Filing: 1980-12-01
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Granted: 1982-11-09
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Expires: 2000-12-01
Abstract
Abstract A method for modifying the surface characteristics of copper foil by contacting a surface thereof with an oxidizing composition; and use of the treated copper foil in the preparation of printed circuits.
Inventors
- 👤 Michael J. Canestaro
- 👤 Edmond O. Fey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:59
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/63; H; H05; H05K; H05K3/00; H05K3/38; H05K3/381; H05K3/382; H05K3/385; H05K2203/00; H05K2203/03; H05K2203/0307; H05K2203/0315; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K2203/11; H05K2203/1152
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A method for preparing a printed circuit which comprises: (A) contacting a nodular surface of a copper foil with an oxidizing composition for a length of time sufficient to oxidize said nodular surface of said copper foil to further roughen said nodular surface; (B) laminating the copper foil and dielectric substrate material together with said nodular surface confronting the surface of said substrate; (C) removing the copper from said substrate etching; (D) catalyzing said substrate for electroless metal deposition subsequent to removing the copper in step (C); and (E) electrolessly plating the substrate with conductive metal.
Claim 2
Independent Claim
96 words
A method for preparing a printed circuit which comprises: (A) contacting a nodular surface of a copper foil with an oxidizing composition for a length of time sufficient to oxidize said nodular surface of said copper foil to further roughen said nodular surface; (B) laminating the copper foil and dielectric substrate material together with said nodular surface confronting the surface of said substrate; (C) removing the copper from said substrate etching; (D) catalyzing said substrate for electroless metal deposition subsequent to removing the copper in step (C); and (E) electrolessly plating the substrate with conductive metal.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said oxidizing composition is an alkali chlorite solution.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the composition is at a temperature of about 185° to about 195° F.
Claim 5
Dependent Claim
41 words
The method of claim 1 wherein said nodular surface is oxidized in step (C) to provide micronodules on the oxidized surfaces which are one tenth or less the size of the nodules already on the copper foil prior to the oxidizing.
Claim 6
Dependent Claim
46 words
The method of claim 1 wherein said oxidizing composition is an alkali chlorite solution containing alkali metal chlorite in a concentration of about 2 to about 10 percent by weight and alkali metal hydroxide in a concentration of about 0.3 to about 0.7 percent by weight.
Claim 7
Dependent Claim
19 words
The method of claim 5 wherein said alkali metal chlorite is sodium chlorite and said hydroxide is sodium hydroxide.
Claim 8
Dependent Claim
20 words
The method of claim 5 wherein the concentration of said chlorite is about 5.5 to about 6.5 percent by weight.
Claim 9
Dependent Claim
23 words
The method of claim 1, 2, 5 or 6 wherein said composition is at a temperature of about 140° to about 200° F.
Claim 10
Dependent Claim
17 words
The method of claim 2, 5, 6, or 1 wherein said dielectric substrate includes an epoxy resin.
Claim 11
Dependent Claim
15 words
The method of claim 2, 5, 6, or 1 wherein said conductive metal is copper.
Claim 12
Dependent Claim
21 words
The method of claim 2, 5, 6, or 1 wherein said etching is carried out by immersion in an etching bath.
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |