Patent US5346747A successfully refreshed from Google Patents.
US5346747A
Expired / Lapsed
US
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Composite printed circuit board substrate and process for its manufacture
Assignee: Granmont Inc
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Filing: 1992-12-24
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Granted: 1994-09-13
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Expires: 2012-12-24
Abstract
Abstract Composite printed circuit board substrates having fiber reinforcement in a polymer matrix are disclosed. The fibers may be thermotropic melt processable liquid crystal polymer fibers.
Inventors
- 👤 Vincent M. Vancho
- 👤 Hak H. Wu
- 👤 Yutao Ma
- 👤 Erik L. Jorgensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:58
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; C; C08; C08J; C08J5/00; C08J5/04; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0141; H05K2201/0145; H05K2201/02; H05K2201/0275; H05K2201/0278; H05K2201/0293; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
A composite printed circuit board substrate having a fibre reinforcement and a polymer matrix, wherein the fibre reinforcement comprises thermotropic melt processable liquid crystal polymer (LCP) fibres.
Claim 2
Dependent Claim
27 words
A composite printed circuit board substrate having a fibre reinforcement and a polymer matrix, wherein the fibre reinforcement comprises thermotropic melt processable liquid crystal polymer (LCP) fibres.
Claim 3
Dependent Claim
53 words
A substrate according to claim 1 wherein the fibres are made of a polyester type thermotropic liquid crystal polymer comprising: a) units derived from at least one aromatic or cycloaliphatic dicarboxy acid, and b) units derived from a mixture of at least two hydroquinones mono-substituted with aralkyl groups containing at least 7 carbons.
Claim 4
Dependent Claim
56 words
A substrate according to claim 2 where the fibers are made of a polyester thermotropic liquid crystal polymer comprising: a) units derived from terephthalic acid, and b) units derived from a mixture of (I) 2-(alpha phenyl isopropyl) hydroquinone and (II) (1-phenyl ethyl) hydroquinone, their molar ratio (II)/(I) being within the range of from 0.5 to 1.8.
Claim 5
Dependent Claim
22 words
A substrate according to claim 1 wherein the thermotropic melt processable LCP fibres are arranged in the form of a nonwoven fabric.
Claim 6
Dependent Claim
25 words
A substrate according to claim 1 wherein the polymeric matrix is a thermoset resin selected from the following groups, epoxy, multifunctional epoxy, polyimide, cyanate esters.
Claim 7
Dependent Claim
34 words
A printed circuit board comprising: a) a substrate sheet comprising reinforcement made of thermotropic melt processable LCP fibres and a thermoset resin, and b) at least one layer of metal laminated onto the substrate.
Claim 8
Dependent Claim
34 words
A printed circuit board comprising: a) a substrate sheet comprising reinforcement made of thermotropic melt processable LCP fibres and a thermoset resin, and b) at least one layer of metal laminated onto the substrate.
References Cited (Backward Citations)
DE2031132A1
Cited
EP0209391A2
Cited
JPS6236892A
Cited
US4876120A
Cited
US5013819A
Cited
EP0373871A1
Cited
EP0381206A2
Cited
US5079673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |