US4888450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit board fabrication leading to increased capacity
Assignee: Nokia Bell Labs
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Filing: 1985-06-28
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Granted: 1989-12-19
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Expires: 2005-06-28
Abstract
Abstract Printed circuit boards having a plurality of circuit layers are produced using a specific processing sequence. A copper-clad substrate is first patterned in a desired configuration to produce the first layer of the printed circuit board. The patterned metallization is then covered with a specifically formalated energy sensitive material. The energy sensitive material is delineated in a desired pattern and developed to uncover portions of the underlying metallization pattern. The entire substrate is blanket-cured to produce a rigid layer having openings in appropriate places. The openings are metallized and a second copper pattern is produced on the cured polymer by conventional metallization and lithographic techniques. If desired, the process is repeated until a suitable number of copper patterned levels are obtained.
Inventors
- 👤 David J. Lando
- 👤 Frederick R. Wight, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:57
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/46; H05K3/4644; H05K3/4661; G; G03; G03F; G03F7/00; G03F7/0035; H05K3/4673; H05K3/4676; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0133; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/09509; H05K3/0011; H05K3/0017; H05K3/0023; H05K3/10; H05K3/18; H05K3/181
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
A product comprising a first and second pattern of conductive material, an electrically insulating material interposed between said first and second pattern, and an electrical connection between said first and second pattern through said insulating material by a conductive via CHARACTERIZED IN THAT said conductive via and said insulating material is formed by subjecting an energy-sensitive material to electromagnetic radiation processing said energy-sensitive material to form said via and to produce said insulating material wherein said energy-sensitive material comprises an acrylated rubber, an acrylated epoxy having a glass transition temperature of at least 50 degrees C. that is capable of reacting with said acrylated rubber under the influence of said electromagnetic radiation and a viscosity modifier.
Claim 2
Dependent Claim
116 words
A product comprising a first and second pattern of conductive material, an electrically insulating material interposed between said first and second pattern, and an electrical connection between said first and second pattern through said insulating material by a conductive via CHARACTERIZED IN THAT said conductive via and said insulating material is formed by subjecting an energy-sensitive material to electromagnetic radiation processing said energy-sensitive material to form said via and to produce said insulating material wherein said energy-sensitive material comprises an acrylated rubber, an acrylated epoxy having a glass transition temperature of at least 50 degrees C. that is capable of reacting with said acrylated rubber under the influence of said electromagnetic radiation and a viscosity modifier.
Claim 3
Dependent Claim
31 words
The product of claim 1 wherein said energy sensitive material comprises an acrylated rubber, an epoxy having a glass transition temperature of at least 50 degrees C. and a viscosity modifier.
Claim 4
Dependent Claim
12 words
The product of claim 2 wherein said viscosity modifier comprises a solvent.
Claim 5
Dependent Claim
12 words
The product of claim 2 wherein said viscosity modifier comprises a monomer.
Claim 6
Dependent Claim
28 words
The product of claim 4 wherein said monomer comprises a member of the group consisting of isobornyl acrylate, hydroxyethyl acrylate, dicyclopentenyl oxyethyl acrylate, ethylhexyl acrylate, and, n-vinyl pyrollidone.
Claim 7
Dependent Claim
14 words
The product of claim 1 wherein said acrylated rubber is an acrylated butadiene/acrylonitrile rubber.
Claim 8
Dependent Claim
15 words
The product of claim 1, 2 or 6 wherein said epoxy is formed from bisphenol-A.
Claim 9
Dependent Claim
59 words
A body comprising (1) a substrate, (2) at least one electrically conducting pattern overlying said substrate, and (3) an insulating material overlying said electrically conducting pattern CHARACTERIZED IN THAT said insulating material is formed from a material comprising an acrylated rubber, an acrylated epoxy having a glass transition temperature of at least 50 degrees C. and a viscosity modifier.
Claim 10
Dependent Claim
59 words
A body comprising (1) a substrate, (2) at least one electrically conducting pattern overlying said substrate, and (3) an insulating material overlying said electrically conducting pattern CHARACTERIZED IN THAT said insulating material is formed from a material comprising an acrylated rubber, an acrylated epoxy having a glass transition temperature of at least 50 degrees C. and a viscosity modifier.
Claim 11
Dependent Claim
12 words
The body of claim 8 wherein said viscosity modifier comprises a solvent.
Claim 12
Dependent Claim
12 words
The body of claim 8 wherein said viscosity modifier comprises a monomer.
Claim 13
Dependent Claim
28 words
The body of claim 10 wherein said modifier comprises a member of the group consisting of isobornyl acrylate, hydroxyethyl acrylate, dicyclopentenyl oxyethyl acrylate, ethylhexyl acrylate, and N-vinyl prollidone.
Claim 14
Dependent Claim
14 words
The body of claim 8 wherein said acrylated rubber is an acrylated butadiene/acrylonitrile rubber.
Claim 15
Dependent Claim
16 words
The body of either claim 8, 9 or 12 wherein said epoxy is formed from bisphenol-A.
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |