Patents by Inventor Yukihiro Katai

Yukihiro Katai 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).

  • Apparatus containing cooling and warming devices for the preparation of a polymer solution
    Patent number: 6367960
    Abstract: An apparatus for the preparation of polymer solutions contains a stirring device, a cooling device connected to the stirring device and a warming device connected to the cooling device. Both the warming device and the cooling device are characterized by including a rotary screw. The stirring device functions to mix a polymer with a solvent to produce a swelled polymer in the solvent. The incorporation of a screw into the warming or cooling device allows the temperature of the solution to change while simultaneous mixing and shear is provided.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: April 9, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidekazu Yamazaki, Tadahiro Tsujimoto, Yukihiro Katai
  • PROCESS AND APPARATUS FOR THE PREPARATION OF POLYMER SOLUTION
    Publication number: 20020006077
    Abstract: A process for the preparation of a polymer solution comprises the steps of: mixing a polymer with a solvent to swell the polymer in the solvent; cooling the swelled mixture to a temperature of −100 to −10° C.; and then warming the cooled mixture to a temperature of 0 to 120° C. to dissolve the polymer in the solvent. According to the present invention, the swelled mixture is cooled at a rate of faster than 1° C. per minute, or the cooled mixture is warmed at a rate of faster than 1° C. per minute. Apparatuses for the preparation of a polymer solution are also disclosed.
    Type: Application
    Filed: June 1, 1998
    Publication date: January 17, 2002
    Inventors: HIDEKAZU YAMAZAKI, TADAHIRO TSUJIMOTO, YUKIHIRO KATAI
  • Process for the preparation of polymer solution
    Patent number: 5973109
    Abstract: A process for the preparation of a polymer solution comprises the steps of: mixing a polymer with a solvent to swell the polymer in the solvent; cooling the swelled mixture; and then warming the cooled mixture to dissolve the polymer in the solvent. The present invention uses a polymer other than cellulose esters of lower fatty acids to form the polymer solution.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: October 26, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidekazu Yamazaki, Tadahiro Tsujimoto, Yukihiro Katai
  • Preparation of a polymer solution
    Patent number: 5783121
    Abstract: A preparation of a polymer solution comprising the steps of: mixing a polymer with a solvent to swell the polymer in the solvent; cooling the swelled mixture to a temperature of -100.degree. to -10.degree. C.; and then warming the cooled mixture to a temperature of 0.degree. to 120.degree. C. to dissolve the polymer in the solvent. The swelled mixture is cooled at a rate of faster than 1.degree. C. per minute, or the cooled mixture is warmed at a rate of faster than 1.degree. C. per minute. Apparatuses for the preparation of a polymer solution are also disclosed.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: July 21, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidekazu Yamazaki, Tadahiro Tsujimoto, Yukihiro Katai