US3682859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free-flowing tetrafluoroethylene polymer composition and process of producing the same
Assignee: Zeneca Inc
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Filing: 1969-06-20
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Granted: 1972-08-08
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Expires: 1989-06-20
Abstract
Abstract A FREE-FLOWING TETRAFLUOROETHYLENE POLYMER COMPOSITION WHICH COMPRISES A UNIFORM MIXTURE OF TETRAFLUOROETHYLENE POLYMER PARTICLES HAVING A MAXIMUM DIMENSION OF BETWEEN 10 TO 100 MICRONS AND BETWEEN 0.01 TO 10 WEIGHT PERCENT OF A FLUORINATED ETHYLENE/PROPYLENE COPOLYMER. THE MIXTURE MAY HAVE FILLERS, E.G. ABOUT 5 TO 40 WEIGHT PERCENT OF GLASS FIBERS. THE PROCESS OF PRODUCING THE AFORESAID FREE-FLOWING MIXTURE INCLUDES THE STEPS OF TUMBLING THE TETRAFLUOROETHYLENE POLYMER AND THE COPOLYMER IN THE PRESENCE OF AN ORGANIC LIQUID WHICH WETS THE TETRAFLUOROETHYLENE POLYMER AND WHICH HAS A SURFACE TENSION OF BELOW 40.0 DYNES PER CENTIMETER.
Inventors
- 👤 Ronald B Taylor
- 👤 Kerin G Boardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L2205/00; C08L2205/14; C08L2205/18; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |