US3655853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polytetrafluoroethylene filaments
Assignee: EIDP Inc
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Filing: 1970-08-10
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Granted: 1972-04-11
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Expires: 1990-08-10
Abstract
Abstract POLYTETRAFLUOROETHYLENE FILAMENTS OF IMPROVED STRENGTH ARE PRODUCED BY EXTRUDING A MIXTURE OF VISCOSE AND PTFE AQUEOUS DISPERSION HAVING AN AVERAGE PARTICLE SIZE OF FROM 0.1 TO 0.17 MICRON INTO AN ACIDIC COAGULATING AND REGENERATING BATH.
Inventors
- 👤 Arthur R Gallup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:37
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/44; D01F6/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |