US2902477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of perfluorochloroolefin polymers
Assignee: Hoechst AG
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Filing: 1956-08-07
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Granted: 1959-09-01
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Expires: 1976-08-07
Abstract
No abstract record available.
Inventors
- 👤 Fischer Edgar
- 👤 Bier Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08F; C08F8/00; C08F8/06; C08J7/00; C08J7/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
A PROCESS FOR TREATING A POLYMER CONSISTING ESSENTIALLY OF POLYTRIFLUOROCHLOROETHYLENE WHICH COMPRISES MAINTAINING SAID POLYMER AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 200* C. AND INTIMATELY CONTACTING SAID POLYMER IN FINELY DIVIDED FORM IN AN OZONIZED ATMOSPHERE CONTAINING AT LEAST 0.1 PERCENT OZONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |