Patent US4701576A successfully refreshed from Google Patents.
US4701576A
Expired / Lapsed
US
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Electrical transmission line
Assignee: Junkosha Co Ltd
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Filing: 1986-05-23
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Granted: 1987-10-20
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Expires: 2006-05-23
Abstract
Abstract An electrical transmission line of the twisted pair of coaxial cable type is provided. One line has a center conductor, a porous plastic dielectric disposed around the outer periphery of the conductor, the dielectric having specific gravity of 0.5 or less, and having a plastic dielectric sheath disposed around the outer periphery of the porous dielectric, the outer sheath having a melting temperature which is 60% or less than the melting temperature of the porous plastic dielectric. The porous plastic dielectric may be in tape form helically wrapped around the conductor, preferably at a wrap angle of 20 degrees or less. The preferred porous dielectric is expanded polytetrafluoroethylene.
Inventors
- 👤 Toshio Wada
- 👤 Tatsuo Hirano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:50
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/18; H01B11/1834; H01B11/1839; H01B11/20; H01B11/203; H01B7/00; H01B7/02; H01B7/0233; H01B7/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
An electrical transmission line comprising a center conductor, a porous plastic dielectric material disposed around the periphery of said conductor, the porous plastic dielectric material having specific gravity of 0.5 or less, and a plastic dielectric outer sheath disposed around the outer periphery of the porous plastic dielectric material, the outer sheath having a melting temperature which is 60% or less than the melting temperature of the porous plastic dielectric material, wherein said porous plastic dielectric material is expanded, porous, sintered polytetrafluoroethylene and wherein said porous plastic dielectric material is in tape form and is helically wound around said conductor at a pitch angle of 20 degrees or less with respect to the longitudinal axis of said conductor.
Claim 2
Dependent Claim
118 words
An electrical transmission line comprising a center conductor, a porous plastic dielectric material disposed around the periphery of said conductor, the porous plastic dielectric material having specific gravity of 0.5 or less, and a plastic dielectric outer sheath disposed around the outer periphery of the porous plastic dielectric material, the outer sheath having a melting temperature which is 60% or less than the melting temperature of the porous plastic dielectric material, wherein said porous plastic dielectric material is expanded, porous, sintered polytetrafluoroethylene and wherein said porous plastic dielectric material is in tape form and is helically wound around said conductor at a pitch angle of 20 degrees or less with respect to the longitudinal axis of said conductor.
Claim 3
Dependent Claim
14 words
The transmission line of claim 1 wherein said outer sheath has a rectangular cross-section.
Claim 4
Dependent Claim
146 words
A multiconductor flat cable transmission line comprising a plurality of individual transmission lines, each having a rectangular cross section, bonded together at their respective interfaces, wherein each said individual transmission line comprises a center conductor, a porous plastic dielectric material disposed around the outer periphery of said conductor, the porous plastic dielectric material having specific gravity of 0.5 or less, and a plastic dielectric outer sheath disposed around the outer periphery of the porous plastic dielectric material, the outer sheath having a melting temperature which is 60% or less than the melting temperature of the porous plastic dielectric material, wherein said porous plastic dielectric material is expanded, porous, sintered polytetrafluoroethylene and wherein said porous plastic dielectric material is in tape form and is helically wound around said conductor at a pitch angle of 20 degrees or less with respect to the longitudinal axis of said conductor.
Claim 5
Dependent Claim
146 words
A multiconductor flat cable transmission line comprising a plurality of individual transmission lines, each having a rectangular cross section, bonded together at their respective interfaces, wherein each said individual transmission line comprises a center conductor, a porous plastic dielectric material disposed around the outer periphery of said conductor, the porous plastic dielectric material having specific gravity of 0.5 or less, and a plastic dielectric outer sheath disposed around the outer periphery of the porous plastic dielectric material, the outer sheath having a melting temperature which is 60% or less than the melting temperature of the porous plastic dielectric material, wherein said porous plastic dielectric material is expanded, porous, sintered polytetrafluoroethylene and wherein said porous plastic dielectric material is in tape form and is helically wound around said conductor at a pitch angle of 20 degrees or less with respect to the longitudinal axis of said conductor.
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) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |