Patents by Inventor Katako Ueda

Katako Ueda 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 cellulose acetate film
    Patent number: 7148344
    Abstract: Using the dope containing the following cellulose acetate (1), (2), or (3), a film is prepared by the casting process: (1) a cellulose acetate having carboxyl groups binding to at least one member selected from the group consisting of a cellulose acetate and a hemicellulose acetate, wherein at least a part of said carboxyl groups are in an acidic form; (2) a cellulose acetate containing at least one member selected from the group consisting of an acid having an acid dissociation exponent pKa of 1.93 to 4.50 in water, an alkali metal salt of said acid and an alkaline earth metal of said acid; or (3) a cellulose acetate containing an alkali metal or an alkaline earth metal wherein the total content of an alkaline metal and an alkaline earth metal in 1 gram of the cellulose acetate is from an effective amount to 5.5×10?6 equivalent (in terms of ion equivalent). The above cellulose acetate is also useful for spinning process. The cellulose acetate includes a cellulose diacetate and a cellulose triacetate.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: December 12, 2006
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yukiko Nakanishi, Hiroki Taniguchi, Katako Ueda
  • Cellulose acetate and dope containing the same
    Patent number: 7122660
    Abstract: Using the dope containing the following cellulose acetate (1), (2), or (3), a film is prepared by the casting process: (1) a cellulose acetate having carboxyl groups binding to at least one member selected from the group consisting of a cellulose acetate and a hemicellulose acetate, wherein at least a part of said carboxyl groups are in an acidic form; (2) a cellulose acetate containing at least one member selected from the group consisting of an acid having an acid dissociation exponent pKa of 1.93 to 4.50 in water, an alkali metal salt of said acid and an alkaline earth metal of said acid; or (3) a cellulose acetate containing an alkali metal or an alkaline earth metal wherein the total content of an alkaline metal and an alkaline earth metal in 1 gram of the cellulose acetate is from an effective amount to 5.5×10?6 equivalent (in terms of ion equivalent). The above cellulose acetate is also useful for spinning process. The cellulose acetate includes a cellulose diacetate and a cellulose triacetate.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: October 17, 2006
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yukiko Nakanishi, Hiroki Taniguchi, Katako Ueda