US4690833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Providing circuit lines on a substrate
Assignee: International Business Machines Corp
•
Filing: 1986-03-28
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Granted: 1987-09-01
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Expires: 2006-03-28
Abstract
Abstract A process for providing circuit lines on a substrate having a non-planar surface is provided. The process includes applying a layer of photoresist material to the substrate, selectively screen printing on non-planar areas of the substrate a screen-printable coating, photoprocessing the layer of photoresist material, and providing electrical conductive pattern on the substrate.
Inventors
- 👤 William A. Donson
- 👤 James V. Ellerson
- 👤 Richard B. Hammer
- 👤 William Lafer
- 👤 Keith A. Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:52
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0073; H05K3/0079; H05K1/00; H05K1/02; H05K1/0284; H05K2201/00; H05K2201/09; H05K2201/09009; H05K2201/09018; H05K2203/00; H05K2203/05; H05K2203/0562; H05K2203/0588; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K2203/0756; H05K2203/0759; H05K3/02; H05K3/06; H05K3/061; H05K3/064; H05K3/10; H05K3/12; H05K3/1216; H05K3/38; H05K3/388
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
87 words
A process for providing circuit lines on a substrate wherein said substrate has non-planar areas which comprise: applying a layer of photoresist material in a liquid form to said substrate; selectively screen printing on non-planar areas of the substrate a screen printable coating wherein said screen printable coating has sufficient viscosity so as to resist pull back and thinning at the corners of the contoured surface to thereby prevent undercutting or voids; photoprocessing said layer of photoresist material; and providing predetermined electrically conductive pattern on said substrate.
Claim 2
Dependent Claim
87 words
A process for providing circuit lines on a substrate wherein said substrate has non-planar areas which comprise: applying a layer of photoresist material in a liquid form to said substrate; selectively screen printing on non-planar areas of the substrate a screen printable coating wherein said screen printable coating has sufficient viscosity so as to resist pull back and thinning at the corners of the contoured surface to thereby prevent undercutting or voids; photoprocessing said layer of photoresist material; and providing predetermined electrically conductive pattern on said substrate.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said photoresist material is a negative photoresist material.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein as screen printable coating is resistant to etchants for copper and chrome.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said substrate is a ceramic.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said substrate has pin holes.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein said pin holes are chamfered holes.
Claim 8
Dependent Claim
26 words
The process of claim 4 wherein said ceramic includes a layer of chrome followed by a layer of copper followed by a layer of chrome thereon.
Claim 9
Dependent Claim
32 words
The process of claim 1 wherein said layer of photoresist material is about 10 to about 80 kiloangstroms thick and said screen printable coating is about 15 to about 80 microns thick.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein said layer of photoresist material is about 30 to about 50 kiloangstroms thick.
Claim 11
Dependent Claim
15 words
The process of claim 9 wherein said screen printable coating is about 40±20 microns thick.
Claim 12
Dependent Claim
20 words
The process of claim 1 wherein said layer of photoresist material is applied prior to applying said screen printable coating.
Claim 13
Dependent Claim
20 words
The process of claim 11 wherein said layer of photoresist material is developed prior to applying said screen printable coating.
Claim 14
Dependent Claim
18 words
The process of claim 1 wherein said layer of photoresist material is applied by blanket spraying the substrate.
Claim 15
Dependent Claim
14 words
The process of claim 5 wherein said screen printable composition fills said pin holes.
Claim 16
Dependent Claim
28 words
The process of claim 1 wherein said substrate is a metallized ceramic and the predetermined electrically conductive pattern is provided by etching the metal of said metallized ceramic.
Claim 17
Dependent Claim
23 words
The process of claim 7 wherein the predetermined electrically conductive pattern is provided by etching each of the layers of chrome and copper.
Claim 18
Dependent Claim
21 words
The process of claim 16 wherein said substrate has pin hole and wherein said screen printable composition fills said pin holes.
References Cited (Backward Citations)
US3904492A
Cited
US3873313A
Cited
US4003877A
Cited
US4064287A
Cited
US3934336A
Cited
US4017968A
Cited
US4179800A
Cited
US4180604A
Cited
US4243700A
Cited
US4157936A
Cited
US4310571A
Cited
US4301189A
Cited
US4270985A
Cited
US4312897A
Cited
US4486466A
Cited
US4421814A
Cited
US4259421A
Cited
US4401686A
Cited
US4470872A
Cited
US4508754A
Cited
US4529477A
Cited
US4481049A
Cited
US4521274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |