Patents by Inventor Shigeharu Iida

Shigeharu Iida 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 of preparing (perfluoroalkyl) ethyl acrylic esters and methods of preparing copolymers using said esters
    Patent number: 6660803
    Abstract: A polyfluoroalkyl iodide is reacted with a (meth)acrylic acid metal salt to form a corresponding polyfluoroalkyl (meth)acrylate ester. The polyfluoroalkyl (meth)acrylate ester is separated from the reaction product through the evaporation, so that the ester is recovered. According to the present method, the polyfluoroalkyl iodide is reacted with the (meth)acrylic acid metal salt without introducing water, thus making it possible to prepare a polyfluoroalkyl (meth)acrylate ester. The resulting ester can also be used to copolymerize an ethylenically unsaturated compound capable of copolymerizing with the ester.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: December 9, 2003
    Assignee: Daikin Industries, Ltd.
    Inventors: Takashi Yasuhara, Shigeharu Iida, Osamu Yamamoto, Toshitaka Nakano
  • Process for preparing di(fluoroalkyl containing group-substituted alkyl) phosphate salt
    Patent number: 5004825
    Abstract: A di(fluoroalkyl containing group-substituted alkyl) phosphate salt which is useful for a surface active agent, a water- and/or oil-repellent for fiber or paper or an oil resistant agent, can be prepared a process which comprises hydrolyzing a mono-sec.- or tert.-alkyl (di(fluoroalkyl containing group-substituted alkyl) phosphate with a base.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: April 2, 1991
    Assignee: Daikin Industries Ltd.
    Inventors: Tutomu Yoshida, Shigeharu Iida