Patents by Inventor Mai Kitahara

Mai Kitahara 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 decomposing a polycarbonate
    Patent number: 7585930
    Abstract: A method of decomposing a polycarbonate with water in a supercritical or subcritical state. A high-purity dihydroxy compound which is a constituent component of the polycarbonate can be recovered at a high yield by this decomposition method. This decomposition method is environment-friendly because it does not use an organic solvent, easy to be carried out, has a high decomposition rate and rarely causes a side reaction.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: September 8, 2009
    Assignee: Teijin Limited
    Inventors: Mai Kitahara, Masumi Hirata, Tetsuo Ban, Toru Sawaki
  • Fibrous active carbon and nonwoven fabric including the same
    Patent number: 7517832
    Abstract: Disclosed is a fibrous activated carbon wherein fine pores in the surface of the activated carbon have diameters of 0.1-200 nm and the activated carbon is in the form of fiber having a fiber diameter of not more than 1000 nm.
    Type: Grant
    Filed: September 16, 2004
    Date of Patent: April 14, 2009
    Assignee: Teijin Limited
    Inventors: Hiroshi Sakurai, Mai Kitahara, Masumi Hirata, Toru Sawaki
  • Electric Double Layer Capacitor
    Publication number: 20080089012
    Abstract: The present invention concerns an electric double layer capacitor, wherein to increase capacitance, each electrode is formed from activated carbon having an average particle size of 0.1 to 1.0 ?m. Alternatively, to prevent electrode short-circuiting, each electrode is constructed from an electrode layer sheet having an electrode layer formed from activated carbon whose specific area is 500 to 2500 m2/g and whose cumulative particle size (D90) is 0.8 to 6 ?m.
    Type: Application
    Filed: December 21, 2005
    Publication date: April 17, 2008
    Applicant: TEIJIN LIMITED
    Inventors: Tatsuichiro Kon, Jiro Sadanobu, Satoshi Nishikawa, Hiroki Sano, Hiroshi Sakurai, Mai Kitahara
  • Method of decomposing a polycarbonate
    Publication number: 20070185309
    Abstract: A method of decomposing a polycarbonate with water in a supercritical or subcritical state. A high-purity dihydroxy compound which is a constituent component of the polycarbonate can be recovered at a high yield by this decomposition method. This decomposition method is environment-friendly because it does not use an organic solvent, easy to be carried out, has a high decomposition rate and rarely causes a side reaction.
    Type: Application
    Filed: February 8, 2005
    Publication date: August 9, 2007
    Inventors: Mai Kitahara, Masumi Hirata, Tetsuo Ban, Toru Sawaki
  • Carbon fiber nonwoven fabric, and production method and use thereof
    Publication number: 20070122687
    Abstract: A carbon fiber nonwoven fabric comprising an aggregate of carbon microfibers having a fiber diameter of 0.001 to 2 ?m and a production method thereof are provided. The nonwoven fabric is useful as a substrate, precursor and material for a fuel cell electrode. The nonwoven fabric can be mixed with a resin to be used as a composite material and can carry metal to be used in a filter.
    Type: Application
    Filed: November 9, 2004
    Publication date: May 31, 2007
    Applicant: TEIJIN LIMITED
    Inventors: Hiroshi Sakurai, Tstsuo Ban, Masumi Hirata, Toru Sawaki, Mai Kitahara, Hideaki Nitta
  • Fibrous active carbon and nonwoven fabric including the same
    Publication number: 20070054580
    Abstract: A fibrous active carbon having pores in the surface, wherein the pore diameter falls within a range of 0.1 to 200 nm, and, the active carbon is in the form of a fiber, and has a fiber diameter of less than 1000 nm or less.
    Type: Application
    Filed: September 16, 2004
    Publication date: March 8, 2007
    Applicant: TEIJIN LIMITED
    Inventors: Hiroshi Sakurai, Mai Kitahara, Masumi Hirata, Toru Sawaki