US3700627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decolorized polytetrafluoroethylene
Assignee: Pennwalt Corp
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Filing: 1970-05-25
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Granted: 1972-10-24
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Expires: 1990-05-25
Abstract
Abstract POLYTETRAFLUOROETHYLENE FILM FREE OF COLOR IS PRODUCED BY ADDING METAL SALTS TO AN AQUEOUS POLYTETRAFLUOROETHYLENE DISPERSION CONTAINING HYDROCARBON SURFACTANTS, CASTING A FILM FROM THE LATEX AND SINTERING THE FILM IN AIR. THE SALTS ARE ADDED IN 5 TO 300 PARTS PER MILLION BASED ON THE WEIGHT OF THE LATEX.
Inventors
- 👤 Henry C Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:34
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |