US4784901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible printed circuit board base material
Assignee: Japan Gore Tex Inc
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Filing: 1987-04-13
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Granted: 1988-11-15
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Expires: 2007-04-13
Abstract
Abstract A flexible base material for use in printed circuit boards is provided wherein a sheet of porous, expanded polytetrafluoroethylene is impregnated with a bismaleimide-triazine resin, and the resin is cured therein. The sheet may be laminated to a glass cloth and composites may be produced having a multiplicity of layers of such sheets and glass cloths.
Inventors
- 👤 Minoru Hatakeyama
- 👤 Kosuke Moriya
- 👤 Ichiro Komada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:15
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B32B5/22; B32B5/24; B32B5/245; C; C08; C08J; C08J5/00; C08J5/04; C08J5/24; C08J5/241; C08J5/244; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; B32B2260/00; B32B2260/04; B32B2260/046; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0221; B32B2266/0235; B32B2307/00; B32B2307/20; B32B2307/204; B32B2315/00; B32B2315/08; B32B2315/085; B32B2457/00; B32B2457/08; C08J2379/00; C08J2379/04; C08J2379/08; H05K1/0366; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0116; H05K2201/0137; H05K2201/015; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31721; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/3878
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A flexible printed circuit board base material comprising a composite of an expanded, porous PTFE base sheet having cured bismaleimide-triazine resin impregnated within the pores of the base sheet, wherein said base material is laminated to a glass cloth.
Claim 2
Dependent Claim
39 words
A flexible printed circuit board base material comprising a composite of an expanded, porous PTFE base sheet having cured bismaleimide-triazine resin impregnated within the pores of the base sheet, wherein said base material is laminated to a glass cloth.
Claim 3
Dependent Claim
21 words
The printed circuit board base material of claim 1 wherein a glass cloth is laminated between two sheets of said material.
Claim 4
Dependent Claim
42 words
The printed circuit board base material of claim 1 wherein the amount of the bismaleimide-triazine resin contained within said pores of said base sheet is in the range of 30% to 60% by weight, based on the total weight of said composite.
References Cited (Backward Citations)
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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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |