US4755911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer printed circuit board
Assignee: Junkosha Co Ltd
•
Filing: 1987-04-28
•
Granted: 1988-07-05
•
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 14:16
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.
References Cited (Backward Citations)
US2955974A
Cited
US3244795A
Cited
US3467569A
Cited
US3486961A
Cited
US4443657A
Cited
US4423282A
Cited
US4591659A
Cited
US4689110A
Cited
US4640866A
Cited
US4680220A
Cited
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 |