Patent US3260774A successfully refreshed from Google Patents.
US3260774A
Expired / Lapsed
US
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Method for the continuous extrusion of unsintered polytetrafluoroethylene powder
Assignee: Tensolite Insulated Wire Co Inc
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Filing: 1963-01-21
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Granted: 1966-07-12
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Expires: 1983-01-21
Abstract
No abstract record available.
Inventors
- 👤 Norman R Harlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:12
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/05; B29C48/06; B29C48/07; B29C48/08; B29C48/09; B29K; B29K2027/00; B29K2027/12; B29K2027/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METHOD FOR EXTRUDING UNSINTERED POLYTETRAFLUOROETHYLENE WHICH INCLUDES REDUCING THE TEMPERATURE OF AN UNSINTERED POLYTETRAFLUOROETHYLENE POWDERED EXTRUSION COMPOSITION TO A REDUCED TEMPERATURE AT WHICH THE PARTICLES OF UNSINTERED POLYTETRAFLUOROETHYLENE LACK COHERENCE AND ARE GRANULAR, CONTINUOUSLY ADVANCING SUCH COMPOSITION THROUGH A CONFINED ZONE WHILE MAINTAINING SUCH COMPOSITION AT A SAID REDUCED TEMPERATURE, COMPACTING SAID COMPOSITION UNDER INCREASING MECHANICAL PRESSURE AS THE COMPOSITION IS ADVANCED THROUGH SAID CONFINED ZONE TO FORM A DENSELY COMPACTED MASS, THEREAFTER PASSING SAID COMPACTED MASS THROUGH A CONFINED HEATING ZONE UNDER THE MECHANICAL PRESSURE DEVELOPED IN SAID FIRST CONFINED ZONE AND HEATING SAID COMPOSITION TO A TEMPERATURE AT WHICH THE POLYTETRAFLUOROETHYLENE PARTICLES IN SAID COMPOSITION ARE COHERENT AND WHEN LENGTHENED FORM FIBERS, AND THEREAFTER EXTRUDING THE HEATED COMPOSITION FROM FIBERS, SECOND CONFINED ZONE UNDER THE MECHANICAL PRESURE DEVELOPED IN SAID FIRST CONFINED ZONE.
Claim 2
Independent Claim
136 words
A METHOD FOR EXTRUDING UNSINTERED POLYTETRAFLUOROETHYLENE WHICH INCLUDES REDUCING THE TEMPERATURE OF AN UNSINTERED POLYTETRAFLUOROETHYLENE POWDERED EXTRUSION COMPOSITION TO A REDUCED TEMPERATURE AT WHICH THE PARTICLES OF UNSINTERED POLYTETRAFLUOROETHYLENE LACK COHERENCE AND ARE GRANULAR, CONTINUOUSLY ADVANCING SUCH COMPOSITION THROUGH A CONFINED ZONE WHILE MAINTAINING SUCH COMPOSITION AT A SAID REDUCED TEMPERATURE, COMPACTING SAID COMPOSITION UNDER INCREASING MECHANICAL PRESSURE AS THE COMPOSITION IS ADVANCED THROUGH SAID CONFINED ZONE TO FORM A DENSELY COMPACTED MASS, THEREAFTER PASSING SAID COMPACTED MASS THROUGH A CONFINED HEATING ZONE UNDER THE MECHANICAL PRESSURE DEVELOPED IN SAID FIRST CONFINED ZONE AND HEATING SAID COMPOSITION TO A TEMPERATURE AT WHICH THE POLYTETRAFLUOROETHYLENE PARTICLES IN SAID COMPOSITION ARE COHERENT AND WHEN LENGTHENED FORM FIBERS, AND THEREAFTER EXTRUDING THE HEATED COMPOSITION FROM FIBERS, SECOND CONFINED ZONE UNDER THE MECHANICAL PRESURE DEVELOPED IN SAID FIRST CONFINED ZONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |