US3795684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ketene dimers from long chain alkanoic acids with perfluoroalkyl terminal segments
Assignee: ChampionX LLC
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Filing: 1972-10-27
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Granted: 1974-03-05
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Expires: 1992-10-27
Abstract
Abstract POLYFLUROINATED KETENE DIMERS HAVING THE STRUCTURE: 2-((CF3-)2-C(-F)-O-(CH2)N-CH=),3-((CF3-)2-C(-F)-O-(CH2)N-) ,4-(O=)OXETANE WHERE N=AN INTEGER FROM 1-12. THESE COMPOUNDS EXHIBIT UNSUAL WATER REPELLANCY WHERE N=7-12.
Inventors
- 👤 E Domba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:42
CPC Classifications
C; C07; C07D; C07D305/00; C07D305/02; C07D305/10; C07D305/12
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |