Carboxy acids derived from heteroatom containing 3,3-bis-perfluoroalkyl oxetanes
Patent 5097067 Issued on March 17, 1992. Estimated Expiration Date: 
November 29, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 29, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2915554 2965659 3088849 3544663 3655732 3838165 Method for producing perfluoroether oligomers having terminal carboxylic acid groups Fluoroalkyl-carbamyl group containing acrylates and methacrylates 1:1 copolymer of difluoromethylene oxide and tetrafluoroethylene oxide and synthesis Heteroatom containing perfluoroalkyl terminated neopentyl glycols and compositions therefrom Patent #: 4898981 InventorAssigneeApplicationNo. 620232 filed on 11/29/1990US Classes:562/582, Polycarboxylic549/511, Sulfur or halogen attached directly or indirectly to the hetero ring by nonionic bonding562/581, Sulfur562/583EtherExaminersPrimary: Ivy, C. WarrenAssistant: Owens, Amelia Attorney, Agent or FirmForeign Patent References
International ClassesC07C 059/235C07C 059/295 AbstractHeteroatom containing Rf -neopentyl compounds having formula III or IV ##STR1## wherein Rf is a straight chain perfluoroalkyl of 1 to 18 carbon atoms, E is branched or straight chain alkylene of 2 to 10 carbon atoms or said alkylene interrupted by one to three groups selected from the group consisting of --NR--, --S--, --COO--, --OOC--, SO2 --, --CONR--, --NRCO--, --SO2 NR--, and --NRSO2 --, or terminated at the Rf end with --CONR-- or --SO2 NR--, where Rf is attached to the carbon or sulfur atom, or Rf is trifluoroethylene, and for formula III, X is --S--, --SO2 --, or --NR--, or for formula IV, X is --CONR--, or --SO2 NR--, or a direct bond where Rf is attached to the carbon or sulfur atom, and where R is independently hydrogen, alkyl of 1 to 6 carbon atoms or hydroxyalkyl of 2 to 6 carbon atoms, and one or both of T1 and T2 is the residue of a mercapto mono- or dicarboxylic acid of 2 to 4 carbon atoms after removal of the hydrogen from the mercapto group and the other of T1 and T2 is hydroxyl.Other References
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