US3907955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing electrically conductive polytetrafluoroethylene tube
Assignee: Aeroquip AG
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Filing: 1973-07-24
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Granted: 1975-09-23
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Expires: 1993-07-24
Abstract
Abstract An electrically-conducting polytetrafluoroethylene tube having on the inner surface thereof, or in its mass, conductive strips parallel to the axis of the tube is described. It is obtained by the extrusion of a pure Ptfe preform having channels or grooves wherein, at the moment of extrusion, there is flowed an aqueous dispersion of Ptfe containing from 1 to 50 percent by weight of graphite and/or carbon black. This tube is suited to all applications where static electricity has to be dissipated, notably for the high speed transport of fluids in the aeronautic industry.
Inventors
- 👤 Pierre Viennot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/125; B; B29; B29C; B29C48/00; B29C48/022; B29C70/00; B29C70/88; B29C70/882; B29C48/03; B29C48/09; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2995/00; B29K2995/0003; B29K2995/0005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A PROCESS FOR THE MANUFACTURE OF POLYTETRAFLUOROETHYLENE TUBES HAVING A CONDUCTIVE ZONE BY PLACING IN AN EXTURSION PRESS A CYLINDRICAL PERFORM AND A MIXTURE CONTAINING AN ELECTRICALLY CONDUCTIVE PULVERULENT MATERIAL THE IMPROVEMENT OF USING A SINGLE PERFORM OF PURE POLYTETRAFLUOROETHYLENE, SAID PERFORM HAVING CONTINUOUS CHANNELS PARALLEL TO THE AXIS THEREOF AND OF SMALL CROSS-SECTION, AND AT A MOMENT OF EXTRUSION FLOWING WITHOUT PRESSURE INTO THE SAID CHANNELS AN AQUEOUS DISPERSION OF TETRAFLUOROETHYLANE POLYMER CONTAINING UP TO 50 PERCENT BY WEIGHT OF SAID PULVERULENT CONDUCTIVE MATERIAL AND EXTRUDING THE PERFORM.
Claim 2
Dependent Claim
89 words
A PROCESS FOR THE MANUFACTURE OF POLYTETRAFLUOROETHYLENE TUBES HAVING A CONDUCTIVE ZONE BY PLACING IN AN EXTURSION PRESS A CYLINDRICAL PERFORM AND A MIXTURE CONTAINING AN ELECTRICALLY CONDUCTIVE PULVERULENT MATERIAL THE IMPROVEMENT OF USING A SINGLE PERFORM OF PURE POLYTETRAFLUOROETHYLENE, SAID PERFORM HAVING CONTINUOUS CHANNELS PARALLEL TO THE AXIS THEREOF AND OF SMALL CROSS-SECTION, AND AT A MOMENT OF EXTRUSION FLOWING WITHOUT PRESSURE INTO THE SAID CHANNELS AN AQUEOUS DISPERSION OF TETRAFLUOROETHYLANE POLYMER CONTAINING UP TO 50 PERCENT BY WEIGHT OF SAID PULVERULENT CONDUCTIVE MATERIAL AND EXTRUDING THE PERFORM.
Claim 3
Dependent Claim
28 words
The process of claim 1, including using as the preform a preform having on the inner cylindrical surface thereof several continuous open grooves extending parallel to the axis.
Claim 4
Dependent Claim
24 words
The process of claim 1, including using as the preform a preform having in its mass several continuous channels extending parallel to the axis.
Claim 5
Dependent Claim
27 words
The process of claim 1, wherein the step of flowing comprises flowing an aqueous dispersion containing from 1 to 50 percent by weight of conductive pulverulent material.
Claim 6
Dependent Claim
32 words
The process of claim 1, wherein the step of flowing comprises flowing an aqueous dispersion containing a conductive pulverulent material selected from the group consisting of graphite, carbon black and mixtures thereof.
References Cited (Backward Citations)
US2857915A
Cited
US2945265A
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US3070132A
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US3473087A
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US3166688A
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US3303252A
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US3845186A
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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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |