US2685707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of tetrafluoroethylene polymer
Assignee: EIDP Inc
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Filing: 1950-06-30
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Granted: 1954-08-10
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Expires: 1970-06-30
Abstract
No abstract record available.
Inventors
- 👤 Walter E Llewellyn
- 👤 John F Lontz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:36
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/04; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C48/00; B29C48/022; B29C48/03; B29C48/05; C; C08; C08K; C08K5/00; C08K5/01; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; B29C43/00; B29C43/006; B29K; B29K2027/00; B29K2027/12; B29K2027/18; Y; Y10; Y10S; Y10S138/00; Y10S138/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR SHAPING TETRAFLUOROETHYLENE POLYMERS WHICH COMPRISES EXTRUDING THROUGH A DIE AT A TEMPERATURE OF 15* TO 150* C. UNDER COMPACTING PRESSURE A NON-AQUEOUS PRESSURE-COALESCING COMPOSITION WHICH COMPRISES TETRAFLUOROETHYLENE POLYMER PARTICLES OF COLLOIDAL SIZE INTIMATELY ADMIXED WITH AN ORGANIC LUBRICANT HAVING A VISCOSITY OF AT LEAST 0.45 CENTIPOISE AT 25* C., SAID LUBRICANT BEING LIQUID UNDER THE EXTRUSION CONDITIONS AND PRESENT IN QUANTITY OF FROM 5% TO 50% OF THE COMBINED WEIGHT OF SAID TETRAFLUOROETHYLENE POLYMER AND LUBRICANT, AND THEREAFTER BAKING THE RESULTANT SHAPED ARTICLE AT A TEMPERATURE ABOVE THE SINTERING TEMPERATURE OF THE POLYMER, SAID LUBRICANT BEING ESSENTIALLY A HYDROCARBON LUBRICANT FROM THE GROUP CONSISTING OF SATURATED ALIPHATIC AND CYCLOALIPHATIC HYDROCARBONS.
Claim 2
Dependent Claim
113 words
A PROCESS FOR SHAPING TETRAFLUOROETHYLENE POLYMERS WHICH COMPRISES EXTRUDING THROUGH A DIE AT A TEMPERATURE OF 15* TO 150* C. UNDER COMPACTING PRESSURE A NON-AQUEOUS PRESSURE-COALESCING COMPOSITION WHICH COMPRISES TETRAFLUOROETHYLENE POLYMER PARTICLES OF COLLOIDAL SIZE INTIMATELY ADMIXED WITH AN ORGANIC LUBRICANT HAVING A VISCOSITY OF AT LEAST 0.45 CENTIPOISE AT 25* C., SAID LUBRICANT BEING LIQUID UNDER THE EXTRUSION CONDITIONS AND PRESENT IN QUANTITY OF FROM 5% TO 50% OF THE COMBINED WEIGHT OF SAID TETRAFLUOROETHYLENE POLYMER AND LUBRICANT, AND THEREAFTER BAKING THE RESULTANT SHAPED ARTICLE AT A TEMPERATURE ABOVE THE SINTERING TEMPERATURE OF THE POLYMER, SAID LUBRICANT BEING ESSENTIALLY A HYDROCARBON LUBRICANT FROM THE GROUP CONSISTING OF SATURATED ALIPHATIC AND CYCLOALIPHATIC HYDROCARBONS.
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) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |