US3129248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of fluorocyclobutanones
Assignee: EIDP Inc
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Filing: 1960-07-18
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Granted: 1964-04-14
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Expires: 1980-07-18
Abstract
No abstract record available.
Inventors
- 👤 David C England
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:23
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/51; C07C45/511; C07C45/513; C07C45/52; C08; C08K; C08K5/00; C08K5/04; C08K5/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF PREPARING A 3,3,4,4-TETRAFLUORO-2,2DIHALOCYCLOBUTANONE WHICH COMPRISES (1) REACTING, AT A TEMPERATURE OF ABOUT 125-250*C., A 1,1-DIFLUORO-2,2-DIHALOETHYLENE WHEREIN ALL HALOGEN IS OF AN ATOMIC NUMBER BETWEEN 9 AND 35, INCLUSIVE, AND A PERFLUOROVINYL HYDROCARBYL ETHER WHEREIN THE HYDROCARBYL RADICAL IS MONOVALENT ALIPHATICALLY SATURATED HYDROCARBON OF UP TO 7 CARBONS AND (2) HYDROLYZING THE RESULTANT 2,2-DIHALO 1,3,3,4,4-PENTAFLUOROCYCLOBUTYL HYDROCARBYL ETHER WITH SULFURIC ACID OF A STRENGTH OF ABOUT 75-98% BY WEIGHT AT A TEMPERATURE OF ABOUT 125-300*C.
Claim 2
Independent Claim
76 words
THE METHOD OF PREPARING A 3,3,4,4-TETRAFLUORO-2,2DIHALOCYCLOBUTANONE WHICH COMPRISES (1) REACTING, AT A TEMPERATURE OF ABOUT 125-250*C., A 1,1-DIFLUORO-2,2-DIHALOETHYLENE WHEREIN ALL HALOGEN IS OF AN ATOMIC NUMBER BETWEEN 9 AND 35, INCLUSIVE, AND A PERFLUOROVINYL HYDROCARBYL ETHER WHEREIN THE HYDROCARBYL RADICAL IS MONOVALENT ALIPHATICALLY SATURATED HYDROCARBON OF UP TO 7 CARBONS AND (2) HYDROLYZING THE RESULTANT 2,2-DIHALO 1,3,3,4,4-PENTAFLUOROCYCLOBUTYL HYDROCARBYL ETHER WITH SULFURIC ACID OF A STRENGTH OF ABOUT 75-98% BY WEIGHT AT A TEMPERATURE OF ABOUT 125-300*C.
References Cited (Backward Citations)
US3039995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |