Patents by Inventor Shoji Okabayashi

Shoji Okabayashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for producing high-purity fluoroalkylsulfonic acid anhydride
    Patent number: 5808149
    Abstract: The present invention relates to a method for producing a fluoroalkylsulfonic acid anhydride represented by a general formula of (C.sub.n F.sub.2n+1 SO.sub.2).sub.2 O where n is an integer ranging from 1 to 8. This method includes a step of (a) reacting diphosphorus pentoxide with a fluoroalkylsulfonic acid represented by a general formula of C.sub.n F.sub.2n+1 SO.sub.3 H where n is an integer ranging from 1 to 8, in a fluorine-containing solvent, thereby to form the fluoroalkylsulfonic acid anhydride in the fluorine-containing solvent. A fluoroalkylsulfonic acid anhydride produced by this method is high in purity and yield.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: September 15, 1998
    Assignee: Central Glass Company, Limited
    Inventors: Tamio Nakamura, Masahiro Tainaka, Yasushi Kita, Shoji Okabayashi, Seigo Okamura