Patents by Inventor Takanori Chiba

Takanori Chiba 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 of preparing rigid polyurethane foam and composition of rigid polyurethane foam
    Patent number: 6713521
    Abstract: A method of preparing a rigid polyurethane foam having improved thermal conductivity, and a composition for such rigid polyurethane foam is provided. In the preparation a rigid polyurethane foam from a composition comprising an aromatic polyisocyanate, a polyol, a blowing agent, a catalyst, a surfactant and other aids, the blowing agent is a blend of cyclopentane and water, and the polyol contains a polyether polyol prepared by addition-polymerizing an alkylene oxide to o-toluenediamine as an initiator.
    Type: Grant
    Filed: March 30, 2000
    Date of Patent: March 30, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Takanori Chiba, Takuya Matsumoto, Keiji Ono, Takehiro Shimizu
  • Method of preparing rigid polyurethane foam and composition of rigid polyurethane foam
    Publication number: 20030060526
    Abstract: A method of preparing a rigid polyurethane foam having improved thermal conductivity, and a composition for such rigid polyurethane foam is provided. In the preparation a rigid polyurethane foam from a composition comprising an aromatic polyisocyanate, a polyol, a blowing agent, a catalyst, a surfactant and other aids, the blowing agent is a blend of cyclopentane and water, and the polyol contains a polyether polyol prepared by addition-polymerizing an alkylene oxide to o-toluenediamine as an initiator.
    Type: Application
    Filed: March 30, 2000
    Publication date: March 27, 2003
    Inventors: Takanori Chiba, Takuya Matsumoto, Keiji Ono, Takehiro Shimizu
  • Magnetic recording medium, a process for preparing a magnetic recording medium and a binder composition therefor
    Patent number: 4686145
    Abstract: A novel magnetic recording medium consisting of a base material, magnetic particles and a specific polyurethane-based binder containing incorporated sulphonate groups, a process for preparing such a magnetic recording medium which comprises coating a base material with a coating material comprising (i) an organic solvent, (ii) a polyurethane binder containing chemically incorporated sulphonate groups and (iii) magnetic particles and the most preferred binder composition therefor comprising a hexandiol-(1,6)-polycarbonate-based polyurethane.
    Type: Grant
    Filed: February 19, 1986
    Date of Patent: August 11, 1987
    Assignee: Sumitomo Bayer Urethane Co., Ltd.
    Inventors: Masaru Honda, Takanori Chiba, Toshiaki Imokawa, Yoshito Harada, Katsumi Nagayasu