US4917963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graded composition primer layer
Assignee: Andus Corp
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Filing: 1988-10-28
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Granted: 1990-04-17
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Expires: 2008-10-28
Abstract
Abstract Bonding between a metallic conductor and a substrate is improved by using a primer layer having a graded composition which continuously varies from a composition predominant in a metal which bonds well to the substrate at the substrate-primer layer interface to a composition predominant in the metal of the conductor at the conductor-primer layer interface. Specifically, the bonding characteristics of copper to polyimide substrate are improved by using a chromium-copper graded composition primer layer which is chromium-rich at the substrate-primer layer interface and copper-rich at the conductor-primer layer interface.
Inventors
- 👤 Wilfred C. Kittler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/20; H; H05; H05K; H05K3/00; H05K3/38; H05K3/388; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/12; Y10T428/12458; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12597; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12861; Y10T428/12903; Y10T428/1291
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
107 words
An assembly comprising a conductor supported by a substrate, comprising (a) a substrate; (b) a graded composition primer layer bonded to said substrate, comprising a first metal and a second metal different from said first metal and having a composition which continuously varies from a predominance of said first metal at the surface facing away from said substrate to a predominance of said second metal at the surface bonded to said substrate, said primer layer being between about 50 and about 500 Å thick; and (c) a conductor made of said first metal and bonded to said primer layer at the surface predominant in said first metal.
Claim 2
Dependent Claim
107 words
An assembly comprising a conductor supported by a substrate, comprising (a) a substrate; (b) a graded composition primer layer bonded to said substrate, comprising a first metal and a second metal different from said first metal and having a composition which continuously varies from a predominance of said first metal at the surface facing away from said substrate to a predominance of said second metal at the surface bonded to said substrate, said primer layer being between about 50 and about 500 Å thick; and (c) a conductor made of said first metal and bonded to said primer layer at the surface predominant in said first metal.
Claim 3
Dependent Claim
28 words
An assembly according to claim 1, wherein said second metal is selected from the group consisting of chromium, nickel, aluminum, titanium, and alloys thereof; nichrome; and stainless steel.
Claim 4
Dependent Claim
12 words
An assembly according to claim 1, wherein said second metal comprises chromium.
Claim 5
Dependent Claim
26 words
An assembly according to claim 1, wherein said first metal is selected from the group consisting of copper, gold, aluminum, silver, palladium, platinum, rhodium, and nickel.
Claim 6
Dependent Claim
12 words
An assembly according to claim 1, wherein said first metal comprises copper.
Claim 7
Dependent Claim
33 words
An assembly according to claim 1, wherein said primer layer consists essentially of said first metal at the first metal predominant surface and of said second metal at the second metal predominant surface.
Claim 8
Dependent Claim
20 words
An assembly according to claim 1, wherein said substrate is selected from the group consisting of glass, ceramic, or polymer.
Claim 9
Dependent Claim
11 words
An assembly according to claim 1, wherein said substrate comprises polyimide.
Claim 10
Dependent Claim
22 words
An assembly according to claim 1, wherein said substrate comprises polyimide, said first metal is copper, and said second metal is chromium.
Claim 11
Independent Claim
117 words
A method of making an assembly comprising a conductor supported by a substrate, comprising the steps of (a) providing a substrate; (b) depositing onto said substrate a graded composition primer layer comprising a first metal and a second metal different from said first metal and having a composition which continuously varies from a predominance of said first metal at one surface to a predominance of said second metal at the other surface, said primer layer being deposited with the second metal predominant surface facing said substrate and having a thickness between about 50 and about 500 Å thick; (c) depositing onto the first metal predominant surface of said primer layer a conductor made of said first metal.
Claim 12
Independent Claim
117 words
A method of making an assembly comprising a conductor supported by a substrate, comprising the steps of (a) providing a substrate; (b) depositing onto said substrate a graded composition primer layer comprising a first metal and a second metal different from said first metal and having a composition which continuously varies from a predominance of said first metal at one surface to a predominance of said second metal at the other surface, said primer layer being deposited with the second metal predominant surface facing said substrate and having a thickness between about 50 and about 500 Å thick; (c) depositing onto the first metal predominant surface of said primer layer a conductor made of said first metal.
Claim 13
Dependent Claim
28 words
A method according to claim 10, wherein said second metal is selected from the group consisting of chromium, nickel, aluminum, titanium, and alloys thereof; nichrome; and stainless steel.
Claim 14
Dependent Claim
12 words
A method according to claim 10, wherein said second metal comprises chromium.
Claim 15
Dependent Claim
26 words
A method according to claim 10, wherein said first metal is selected from the group consisting of copper, gold, aluminum, silver, palladium, platinum, rhodium, and nickel.
Claim 16
Dependent Claim
12 words
A method according to claim 10, wherein said first metal comprises copper.
Claim 17
Dependent Claim
33 words
A method according to claim 10, wherein said primer layer consists essentially of said first metal at the first metal predominant surface and of said second metal at the second metal predominant surface.
Claim 18
Dependent Claim
14 words
A method according to claim 10, wherein said primer layer is deposited by sputtering.
Claim 19
Dependent Claim
13 words
A method according to claim 10, wherein said conductor is deposited by sputtering.
Claim 20
Dependent Claim
19 words
A method according to claim 10, wherein said conductor is deposited by a combination of sputtering and chemical plating.
Claim 21
Dependent Claim
20 words
A method according to claim 10, wherein said substrate is selected from the group consisting of glass, ceramic, or polymer.
Claim 22
Dependent Claim
11 words
A method according to claim 10, wherein said substrate comprises polyimide.
Claim 23
Dependent Claim
22 words
A method according to claim 10, wherein said substrate comprises polyimide, said first metal is copper, and said second metal is chromium.
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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) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |