US Patent No: 8,007,700
Number of patents in Portfolio can not be more than 2000
Coaxial cable of low dielectric constant, and a fabrication method and tool therefor
Stats
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Aug 30, 2011
Issued date -
Aug 1, 2008
filing date -
12/222,090
serial no -
In Force
status
Importance
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Abstract
An electric cable for conveying signals, the cable having a diameter of less than 2 mm and comprising at least one conductor in an insulating sheath, the sheath having a dielectric constant .epsilon. of less than 1.7. To achieve this, the sheath is made of PTFE and it includes at least one continuous cell. Fabrication is preferably by performing the following operations: compressing a lubricant-impregnated PTFE powder in a converging chamber arranged in an extrusion die and around a guide for guiding said at least one conductor, the impregnated PTFE powder thus being thrust towards an extrusion orifice to form an extrudate; causing said extrudate to pass from said orifice along an extrusion passage inside the die, in which it is shaped around the conductor(s), and of inside section that corresponds to the outline desired for the sheath; passing said extrudate around at least one solid bar presenting, at least over a distance within the extrusion passage, the same section as said cell and thereby preventing the extrudate from occupying the section that is to be occupied by said cell, the cell(s) being formed from the downstream end surface(s) of the bar(s) and extending downstream therefrom; extracting the lubricant by evaporation; and sintering the resulting assembly.
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First Claim
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International Classification(s)
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 7,214,880 Communication wire | 12 | 2003 | |
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| 6,815,617 Serrated cable core | 26 | 2002 | |
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| 5,874,032 Method for manufacturing expanded polytetrafluoroethylene products | 20 | 1996 | |
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| 7,163,388 Method and apparatus for incorporating lumens into the wall of a tubular extrusion | 2 | 2004 | |
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| 5,063,018 Extrusion method | 43 | 1990 | |
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| 6,987,224 Polytetrafluoroethylene mixed powder used for insulation of product for high frequency signal transmission and product for high frequency signal transmission using the same | 1 | 2001 | |
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| 2005/0139,377 Paste extruded insulator with air channels | 1 | 2004 | |
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| 5,922,155 Method and device for manufacturing an insulative material cellular insulator around a conductor and coaxial cable provided with an insulator of this kind | 41 | 1997 | |
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| 2007/0098,940 Profiled insulation LAN cables | 3 | 2005 | |
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| 4,225,547 Extrusion process of polytetrafluoroethylene tubing materials and apparatus therefor | 46 | 1978 | |
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| 6,780,360 Method of forming a PTFE insulation layer over a metallic conductor and product derived thereform | 3 | 2001 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Feb 28, 2015 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Feb 28, 2019 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 28, 2023 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |