Patents by Inventor Kazuomi Kubota

Kazuomi Kubota 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).

  • Block copolymer and antithrombotic coating agent
    Patent number: 9474835
    Abstract: The object of the present invention is achieved by providing a copolymer, in particular, a block copolymer which has excellent coating formation ability, adhesive properties to a substrate, and does not adsorb protein; an antithrombotic coating agent which has superior antithrombotic properties and adhesive properties to a substrate to those of the conventional antithrombotic coating agent; and a medical instrument which is obtained by coating the antithrombotic coating agent, and the block copolymer includes a polymer (A) containing a (meth)acrylic ester monomer and a polymer (B) containing a (meth)acrylamide monomer and has excellent coating formation ability and high adhesive properties to a substrate.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: October 25, 2016
    Assignees: Kawamura Institute of Chemical Research, DIC Corporation
    Inventors: Kazutoshi Haraguchi, Kazuomi Kubota, Tooru Takehisa, Tetsuo Takada, Noriko Santou
  • BLOCK COPOLYMER AND ANTITHROMBOTIC COATING AGENT
    Publication number: 20140235748
    Abstract: The object of the present invention is achieved by providing a copolymer, in particular, a block copolymer which has excellent coating formation ability, adhesive properties to a substrate, and does not adsorb protein; an antithrombotic coating agent which has superior antithrombotic properties and adhesive properties to a substrate to those of the conventional antithrombotic coating agent; and a medical instrument which is obtained by coating the antithrombotic coating agent, and the block copolymer includes a polymer (A) containing a (meth)acrylic ester monomer and a polymer (B) containing a (meth)acrylamide monomer and has excellent coating formation ability and high adhesive properties to a substrate.
    Type: Application
    Filed: August 10, 2012
    Publication date: August 21, 2014
    Applicants: DIC CORPORATION, KAWAMURA INSTITUTE OF CHEMICAL RESEARCH
    Inventors: Kazutoshi Haraguchi, Kazuomi Kubota, Tooru Takehisa, Tetsuo Takada, Noriko Santou
  • Process for producing lactides and process for purifying crude lactides
    Patent number: 5463086
    Abstract: A process for producing a meso-compound-containing lactide, comprising thermally decomposing a hydroxycarboxylic acid oligomer in the presence of a salt of an alkali metal except sodium and in the presence or absence of a metal of the groups 4 to 15 of the periodic table and/or a salt thereof; and a process for purifying a crude lactide comprising recrystallizing a crude lactide using a poor solvent and a good solvent selected from aliphatic tertiary alcohols, ketones and esters are disclosed. The production ratio of a meso-lactide can be controlled by selection of the kind and the amount of a catalyst so as to obtain a lactide having an appropriate optical purity suitable for production of biodegradable polymers. The purification process achieves a high recovery.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: October 31, 1995
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Kazuomi Kubota, Yoichi Murakami