US5210377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial electric signal cable having a composite porous insulation
Assignee: W.L. Gore and Associates Inc
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Filing: 1992-01-29
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Granted: 1993-05-11
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Expires: 2012-01-29
Abstract
Abstract A crush-resistant high signal propagation velocity coaxial cable insulated with a low-density expanded PTFE insulation surrounded by an extruded closed-cell polymer foam.
Inventors
- 👤 Francis A. Kennedy
- 👤 William G. Hardie
- 👤 Jack J. Hegenbarth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/18; H01B11/1834; H01B11/1839
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
42 words
A coaxial electric signal cable comprising from inside to outside: (a) an electrically conductive signal conductor; (b) a first layer of microporous insulation surrounding said conductor; and (c) a second layer of closed-cell polymer foam insulation surrounding said first layer of insulation.
Claim 2
Dependent Claim
42 words
A coaxial electric signal cable comprising from inside to outside: (a) an electrically conductive signal conductor; (b) a first layer of microporous insulation surrounding said conductor; and (c) a second layer of closed-cell polymer foam insulation surrounding said first layer of insulation.
Claim 3
Dependent Claim
24 words
A cable of claim 1 comprising an electrically conductive shielding surrounding said second layer of insulation and a protective polymeric jacket surrounding said shielding.
Claim 4
Dependent Claim
17 words
A cable of claims 1 or 2 wherein said first layer of microporous insulation comprises expanded polytetrafluoroethylene.
Claim 5
Dependent Claim
20 words
A cable of claim 3 wherein said second layer of insulation comprises an extruded layer of closed-cell thermoplastic polymer foam.
Claim 6
Dependent Claim
17 words
A cable of claim 4 wherein said foam has a void content of about 5 to 95%.
Claim 7
Dependent Claim
17 words
A cable of claim 4 wherein said foam has a void volume of about 50 to 90%.
Claim 8
Dependent Claim
54 words
A cable of claim 4 wherein said thermoplastic polymer foam is selected from the group consisting of polyethylene, polypropylene, polyester, fluoropolymer, fluorinated ethylenepropylene copolymers, perfluoro-alkoxy tetrafluoroethylene polymers, chlorotrifluoroethylene polymers, ethylenechlorotrichloroethylene copolymers, polyvinylidene fluoride polymers, polytetrafluoroethylene polymers containing fluorinated oxygen containing heterocyclic rings, polystyrene, polyformaldehyde polyethers, vinyl polymers, aromatic and aliphatic polyamides, and ethylene-tetrafluoroethylene copolymers.
Claim 9
Dependent Claim
18 words
A cable of claim 3 wherein said expanded polytetrafluoroethylene insulation is tape-wrapped or extruded onto said signal conductor.
Claim 10
Dependent Claim
16 words
A cable of claim 2 wherein said electrically conductive shielding and said signal conductor comprise metals.
Claim 11
Dependent Claim
47 words
A cable of claim 9 wherein said metals are selected from the group consisting of copper, copper alloy, noble metal-plated copper, copper alloy, and aluminum, aluminum, aluminum-copper composite, metals coated with another metal by plasma coating processes, steel, tin and nickel-plated metals, and mu metal magnetic alloy.
Claim 12
Dependent Claim
13 words
A cable of claim 2 wherein said jacket comprises an extruded thermoplastic polymer.
Claim 13
Dependent Claim
13 words
A cable of claim 11 wherein said thermoplastic polymer contains a conductive filler.
Claim 14
Dependent Claim
22 words
A cable of claim 2 comprising additionally a conductive metal drain wire positioned adjacent to and in contact with said conductive shielding.
Claim 15
Dependent Claim
85 words
A process for preparing a coaxial electric signal cable comprising the steps: (a) enclosing an electrically conductive signal conductor with a first insulation layer of porous expanded polytetrafluoroethylene; (b) enclosing said first insulation layer with a second insulation comprising a closed-cell polymer foam; (c) enclosing said second insulation layer with a layer of electrically conductive metal shielding; (d) optionally positioning an electrically conductive drain wire adjacent to and in contact with said shielding; and (e) optionally enclosing said shielding layer with a protective polymeric jacket.
Claim 16
Dependent Claim
85 words
A process for preparing a coaxial electric signal cable comprising the steps: (a) enclosing an electrically conductive signal conductor with a first insulation layer of porous expanded polytetrafluoroethylene; (b) enclosing said first insulation layer with a second insulation comprising a closed-cell polymer foam; (c) enclosing said second insulation layer with a layer of electrically conductive metal shielding; (d) optionally positioning an electrically conductive drain wire adjacent to and in contact with said shielding; and (e) optionally enclosing said shielding layer with a protective polymeric jacket.
Claim 17
Dependent Claim
13 words
Two or more cables of claim 1 twisted together into a single 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) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |