US4431685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decreasing plated metal defects
Assignee: International Business Machines Corp
•
Filing: 1982-07-02
•
Granted: 1984-02-14
•
Expires: 2002-07-02
Abstract
Abstract A method of decreasing plated metal defects by applying a layer of a noble metal such as palladium, platinum, gold, iridium, rhodium, or mixtures thereof between a photoresist and a metallic surface.
Inventors
- 👤 Michael J. Canestaro
- 👤 Donald G. McBride
- 👤 John A. Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:02
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/244; C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1603; C23C18/1605; C23C18/1633; C23C18/1646; C23C18/165; C23C18/1651; C23C18/54; G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/11; H05K3/38; H05K3/382; H05K3/384; H10; H10D; H10D84/00; H10D84/01; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0347; H05K2203/00; H05K2203/07; H05K2203/0703; H05K2203/072; H05K3/10; H05K3/108
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
47 words
A method for decreasing plated metal defects which comprises applying to a metallic surface a layer of a metal different from said metallic surface and being a noble metal, then applying a photoresist layer onto the resulting noble metal coated surface and then electrolessly plating a metal.
Claim 2
Independent Claim
47 words
A method for decreasing plated metal defects which comprises applying to a metallic surface a layer of a metal different from said metallic surface and being a noble metal, then applying a photoresist layer onto the resulting noble metal coated surface and then electrolessly plating a metal.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said metallic surface is selected from the group of copper, nickel, iron, or steel.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said metallic surface is copper or copper alloy.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein said metallic surface is a metal or alloy supported by a dielectric substrate.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein said metallic surface is copper.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein the copper is about 2 to about 12 microns thick.
Claim 8
Independent Claim
27 words
The method of claims 1, 2, 3, 4, 5, or 6 wherein said noble metal is selected from the group of palladium, platinum, gold, iridium, or rhodium.
Claim 9
Independent Claim
25 words
The method of claims 1, 2, 3, 4, 5, or 6 wherein said noble metal is selected from the group of palladium, gold, or platinum.
Claim 10
Independent Claim
21 words
The method of claims 1, 2, 3, 4, 5, or 6 wherein the thickness of said metal layer is a monolayer.
Claim 11
Independent Claim
21 words
The method of claims 1, 2, 3, 4, 5, or 6 wherein said noble metal is applied by immersion coating technique.
Claim 12
Dependent Claim
34 words
The method of claim 1 wherein, prior to the step of plating a metal, the photoresist is developed to expose desired portions of the underlying metallic surface for the subsequent plating of metal thereon.
Claim 13
Dependent Claim
17 words
The method of claim 11 wherein said metal is selected from the group of nickel or copper.
Claim 14
Dependent Claim
12 words
The method of claim 11 wherein said metal is electrolessly coated copper.
Claim 15
Dependent Claim
17 words
The method of claim 11 wherein the plated metal is coated with an immersion tin coating layer.
Claim 16
Dependent Claim
14 words
The method of claim 14 which further includes removing the previously unremoved photoresist material.
Claim 17
Dependent Claim
23 words
The method of claim 15 which further includes removing the thin underlying metallic surface which was protected during the plating by the photoresist.
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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 |