Patent US3973107A successfully refreshed from Google Patents.
Patent US4755911A successfully refreshed from Google Patents.
US4755911A
Expired / Lapsed
US
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Multilayer printed circuit board
Assignee: Junkosha Co Ltd
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Filing: 1987-04-28
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Granted: 1988-07-05
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Expires: 2007-04-28
Abstract
Abstract A multilayer printed circuit board is provided comprising a plurality of printed circuit boards laminated together, each board being separated from an adjacent board by a layer of a dielectric of porous, expanded polytetrafluoroethylene (PTFE). The dielectric layer may have an adhesive on its surface(s) affixed as a layer or in a pattern of dots. Alternatively, an adhesive may be impregnated within the pores of the porous dielectric. In a preferred embodiment, the dielectric has additional openings or through holes in it, in additon to the pores of the porous dielectric.
Inventors
- 👤 Hirosuke Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:18
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K1/032; H05K1/034; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0116; H05K2201/0137; H05K2201/015; H05K2201/0183; H05K2201/0195; H05K2203/00; H05K2203/11; H05K2203/1147; H05K3/38; H05K3/386; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A multilayer printed circuit board comprising a plurality of individual printed circuit boards laminated together, each individual board being separated from an adjacent board by a layer of a dielectric of a porous fluororesin, wherein said layer of a dielectric has an adhesive on at least one surface in the form of discrete dots.
Claim 2
Dependent Claim
54 words
A multilayer printed circuit board comprising a plurality of individual printed circuit boards laminated together, each individual board being separated from an adjacent board by a layer of a dielectric of a porous fluororesin, wherein said layer of a dielectric has an adhesive on at least one surface in the form of discrete dots.
Claim 3
Dependent Claim
15 words
The multilayer printed circuit board of claim 1 wherein said porous fluororesin is porous poly-tetrafluoroethylene.
Claim 4
Dependent Claim
16 words
The multilayer printed circuit board of claim 1 wherein said porous fluororesin is porous, expanded PTFE.
Claim 5
Dependent Claim
20 words
The multilayer printed circuit board of claim 1 wherein said layer of a dielectric has an adhesive on both surfaces.
Claim 6
Dependent Claim
21 words
The multilayer printed circuit board of claim 1 wherein said layer of a dielectric has an adhesive impregnated within its pores.
Claim 7
Dependent Claim
17 words
The multilayer printed circuit board of claim 1 or 5 wherein said adhesive is a fluororesin polymer.
Claim 8
Dependent Claim
30 words
The multilayer printed circuit board of claim 1 wherein at least one of said layers of dielectric has additional through holes, in addition to the pores of said porous dielectric.
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |