Patents by Inventor Tutomu Yoshida

Tutomu Yoshida 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).

  • Process for preparing fluoroalcohol
    Patent number: 5264637
    Abstract: A fluoroalcohol of the formulaRf(CH.sub.2 CH.sub.2 OH)n (1)is prepared by the following three kinds of processes:(a) by contacting a betaine compound with a halide compound of the formulaRf(CH.sub.2 CH.sub.2 X)n (2)to obtain an intermediate compound and subjecting the intermediate compound to hydrolysis,(b) by contacting a betaine compound and water in the presence of an organic solvent with a halide compound of the formulaRf(CH.sub.2 CH.sub.2 X)n (2), or(c) by contacting a betaine type surfactant and water with a halide compound of the formulaRf(CH.sub.2 CH.sub.2 X)n (2),wherein Rf is C.sub.2.about.13 fluoroalkyl or C.sub.2.about.13 fluoroalkylene group, X is iodine or bromine, n is 1 when Rf is fluoroalkyl group and n is 2 when Rf is fluoroalkylene group.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: November 23, 1993
    Assignee: Daikin Industries, Ltd.
    Inventors: Tutomu Yoshida, Kunitada Tanaka, Yasumichi Chiba, Yasuhisa Furutaka, Yukio Homoto
  • 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