Patent US3742013A successfully refreshed from Google Patents.
US3742013A
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Fluorinated compounds containing functional groups
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-07-31
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Granted: 1973-06-26
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Expires: 1989-07-31
Abstract
Abstract GROUPS ATTACHED TO THE OLIGOMER RESIDUE. Derivatives containing the first three of these groups are made by contacting an oligomer with anhydrous gaseous ammonia in a solvent medium or by heating with a concentrated aqueous solution of ammonia. Those containing NHNH2 groups are made by reactions between oligomer and hydrazine. The derivatives may be converted into highly fluorinated nitriles which can be reduced to amines and quaternised with alkyl halides to yield cationic surfactants. Derivatives of oligomers of tetrafluoroethylene and of hexafluoropropene, contain one or more
Inventors
- 👤 Harold Crosbie Fielding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:24
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/186; B22C1/188
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
52 words
A process for making branch chain internally unsaturated compounds consisting essentially of reacting at a temperature of 10* to 100* C anhydrous ammonia with an oligomer of tetrafluoroethylene having the empirical formula (C2F4)n where n is 3 to 7 or hexafluoropropene having the empirical formula (C3F6)n where n is 2 or 3.
Claim 2
Dependent Claim
33 words
The process of claim 2 in which the oligomers are selected from the group consisting of the tetramer C8F16, pentamer C10F20 and the hexamers C12F24 of tetrafluoroethylene and the trimers C9F18 of hexafluoropropene.
Claim 3
Dependent Claim
22 words
A process according to claim 2 in which the reaction is carried out at a temperature of 10* C to 30* C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |