The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2001
Filed:
Sep. 30, 1999
Masayoshi Tatemoto, Settsu, JP;
Daikin Industries Ltd., Osaka, JP;
Abstract
A compound of the formula (1): FSO,CFXCF,O(CFXCF,O),CF—(CF,Y)COF in which X is a fluorine atom, a chlorine atom or a trifluoromethyl group, Y is a fluorine atom, a chlorine atom, a bromine atom or an iodine atom, and n is a number of 0 to 5, preferably 0, 1 or 2, is converted to a compound of the formula (2): MOSO,CFXCF,O(CFXCF,O),CF(CF,Y)COOM,in which X, Y and n are the same as defined above, and M and M,independently represent an alkali metal atom or an alkaline earth metal atom, and then a compound of the formula (2) is pyrolyzed at a temperature of 150 to 250° C. to obtain a compound of the formula (3): ASO,CFXCF,O(CFXCF,O),CF═CF,in which A is MO—, a hydroxyl group or a fluorine atom, and X and n are the same as defined above.