Patents by Inventor Shigeyuki Yoshii

Shigeyuki Yoshii 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 fluorocarboxylic acids
    Patent number: 7253315
    Abstract: A fluorocarboxylic acid preparation process which includes hydrolyzing fluorocarboxylic acid fluoride in the presence of an aqueous sulfuric acid solution to form a reaction product containing a fluorocarboxylic acid and hydrogen fluoride (present as hydrofluoric acid); and removing at least some of the hydrogen fluoride from the reaction product by washing the reaction production with aqueous sulfuric acid solution. The hydrolyzing and washing are carried out at a temperature at which the fluorocarboxylic acid is a liquid.
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: August 7, 2007
    Assignees: Daikin Industries, Ltd., E. I. du Pont de Nemours and Company
    Inventors: Ta-Wei Fu, Steven H. Swearingen, Takuya Ichida, Shigeyuki Yoshii
  • Process for preparing fluorocarboxylic acids
    Publication number: 20050165254
    Abstract: A fluorocarboxylic acid preparation process which includes hydrolyzing fluorocarboxylic acid fluoride in the presence of an aqueous sulfuric acid solution to form a reaction product containing a fluorocarboxylic acid and hydrogen fluoride (present as hydrofluoric acid); and removing at least some of the hydrogen fluoride from the reaction product by washing the reaction production with aqueous sulfuric acid solution. The hydrolyzing and washing are carried out at a temperature at which the fluorocarboxylic acid is a liquid.
    Type: Application
    Filed: March 24, 2005
    Publication date: July 28, 2005
    Inventors: Ta-Wei Fu, Steven Swearingen, Takuya Ichida, Shigeyuki Yoshii
  • Method for producing tetrafluoroethylene
    Patent number: 6849163
    Abstract: There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: February 1, 2005
    Assignee: Daikin Industries, Ltd.
    Inventors: Shigeyuki Yoshii, Yukio Homoto
  • Method for producing tetrafluoroethylene
    Publication number: 20030098228
    Abstract: There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced.
    Type: Application
    Filed: October 7, 2002
    Publication date: May 29, 2003
    Inventors: Shigeyuki Yoshii, Yukio Homoto