US3781258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrafluoroethylene powder and method of preparation thereof
Assignee: Daikin Industries Ltd
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Filing: 1968-09-11
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Granted: 1973-12-25
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Expires: 1988-09-11
Abstract
Abstract A METHOD OF PREPARING A POLYTERTRAFLUOROETHYLENE POWDER HAVING GOOD FLUIDITY WHICH COMPRISES STIRRING AT A TEMPERATURE OF 0-200*C. IN THE PRESENCE OF WATER A COMPOSITION CONSISTING OF ONE PART BY WEIGHT OF A POLYTETRAFLUOROETHYLENE POWDER THE DIAMETERS OF WHICH PARTICLES ARE NOT MORE THAN 300 MICRONS AND 0.1-3.0 PARTS BY WEIGHT OF A WATER IMMISCIBLE LIQUID HAVING A BOILING POINT 0-150*C. AND CAPABLE OF WETTING POLYTETRAFLUOROETHYLENE, THE AMOUNT OF SAID WATER BEING 1.5-50 PARTS BY WEIGHT BASED ON THE COMPOSITION.
Inventors
- 👤 Y Kometani
- 👤 C Okuno
- 👤 S Koizumi
- 👤 T Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:55
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08F; C08F244/00; C08J3/12; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 0
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |