US4640866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board
Assignee: Junkosha Co Ltd
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Filing: 1985-04-01
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Granted: 1987-02-03
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Expires: 2005-04-01
Abstract
Abstract A printed circuit board is provided comprising at least one layer of metal firmly bonded in laminar contact with at least one layer of solid, sintered polytetrafluoroethylene (PTFE). In one embodiment, the solid PTFE layer contains fibers of porous, expanded, sintered PTFE mixed within it. In another embodiment, the solid PTFE layer is firmly bonded to the metal layer on one side and is firmly bonded on the other side to a layer of porous, expanded, sintered PTFE.
Inventors
- 👤 Hirosuke Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:59
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; H05K3/00; H05K3/38; H05K3/386; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0116; H05K2201/0137; H05K2201/015; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A printed circuit board comprising a composite center layer of two layers of solid, sintered, nonporous polytetrafluoroethylene (PTFE) with a central layer of porous, expanded PTFE sandwiched therebetween, each of said solid PTFE layers having a metallic layer bonded to its outer surface by a bonding agent selected from the class consisting of a perfluoroalkylether copolymer (PFA) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).
Claim 2
Dependent Claim
61 words
A printed circuit board comprising a composite center layer of two layers of solid, sintered, nonporous polytetrafluoroethylene (PTFE) with a central layer of porous, expanded PTFE sandwiched therebetween, each of said solid PTFE layers having a metallic layer bonded to its outer surface by a bonding agent selected from the class consisting of a perfluoroalkylether copolymer (PFA) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).
Claim 3
Dependent Claim
19 words
The printed circuit board of claim 1 wherein said solid PTFE layers contain therein fibers of expanded, porous PTFE.
Claim 4
Dependent Claim
12 words
The printed circuit board of claim 2 wherein said fibers are sintered.
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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) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |