Patent US3772249A successfully refreshed from Google Patents.
US3772249A
Expired / Lapsed
US
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Filled polytetrafluoroethylene compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-09-14
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Granted: 1973-11-13
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Expires: 1991-09-14
Abstract
Abstract FILLED PTFE COMPOSITIONS ARE MADE BY MIXING ONE OR MORE FILLERS WITH A DEGRADED PTFE AND THEN ADDING THIS MIXTURE TO AN AQUEOUS DISPERSION OF PTFE AND EFFECTING COAGULATION OF THE PTFE DISPERSION.
Inventors
- 👤 D Morgans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:46
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08K; C08K3/00; C08K3/01; C08K3/013; C08L2205/00; C08L2205/02; C08L2205/14; C08L2205/18
Claims Analysis
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |