US5346747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 12:31
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.
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US4876120A
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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) | 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 |