US4423282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat cable
Assignee: Junkosha Co Ltd
•
Filing: 1981-06-29
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Granted: 1983-12-27
•
Expires: 2001-06-29
Abstract
Abstract An improved flat cable in which parallel, spaced conductors are embedded in an expanded, porous polytetrafluoroethylene insulation and then placed between layers of polytetrafluoroethylene having a higher dielectric constant than the porous insulation. The dielectric constant between conductors can be varied.
Inventors
- 👤 Hirosuke Suzuki
- 👤 Norikazu Ishigohoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:59
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/08; H01B7/0838
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A flat cable comprising a plurality of conductors, arranged in a parallel spaced relationship and embedded in a expanded porous polytetrafluoroethylene insulation the dielectric constant of said porous insulation being variable between adjacent conductors; said embedded conductors contained within said insulation being contained between at least two layers of a substantially nonporous polytetrafluoroethylene insulation having a higher dielectric constant than said porous insulation.
Claim 2
Dependent Claim
63 words
A flat cable comprising a plurality of conductors, arranged in a parallel spaced relationship and embedded in a expanded porous polytetrafluoroethylene insulation the dielectric constant of said porous insulation being variable between adjacent conductors; said embedded conductors contained within said insulation being contained between at least two layers of a substantially nonporous polytetrafluoroethylene insulation having a higher dielectric constant than said porous insulation.
Claim 3
Dependent Claim
12 words
The cable of claim 1 wherein a plastic tape interlaces said conductors.
Claim 4
Dependent Claim
15 words
The cable of claim 1 wherein said conductors are coated with a nonporous resin material.
Claim 5
Dependent Claim
20 words
The cable of claim 1 having an electromagnetic shielding layer affixed to the external surfaces of said nonporous insulation layers.
Claim 6
Dependent Claim
46 words
The cable of claim 1 wherein the porous dielectric insulation is compressed at locations between and adjacent conductors such that the dielectric constant of the porous insulation is increased at locations between conductors and adjacent conductors as a result of said longitudinal compression of the cable.
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |