Patents by Inventor Tomokiyo Doi

Tomokiyo Doi 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).

  • Polyester carbonate copolymer for optical lens and optical lens
    Patent number: 8378055
    Abstract: This invention is to provide a polyester carbonate copolymer suitable for an optical lens that has high refractivity and transparency and low birefringence and little optical strain, and optical lenses formed therefrom. This invention is a polyester carbonate copolymer for an optical lens, which comprises 67 to 95 mol % of a unit of the following formula (I) and 33 to 5 mol % of a unit of the following formula (II) and has a specific viscosity of 0.12 to 0.30, wherein Y in the formula (II) is a phenylene group or a naphthalenediyl group.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: February 19, 2013
    Assignee: Teijin Chemicals, Ltd.
    Inventors: Kazunori Nunome, Manabu Matsui, Kazushi Tando, Teruyuki Shigematsu, Tetsuya Motoyoshi, Tomokiyo Doi
  • POLYESTER CARBONATE COPOLYMER FOR OPTICAL LENS AND OPTICAL LENS
    Publication number: 20120123083
    Abstract: This invention is to provide a polyester carbonate copolymer suitable for an optical lens that has high refractivity and transparency and low birefringence and little optical strain, and optical lenses formed therefrom. This invention is a polyester carbonate copolymer for an optical lens, which comprises 67 to 95 mol % of a unit of the following formula (I) and 33 to 5 mol % of a unit of the following formula (II) and has a specific viscosity of 0.12 to 0.30, wherein Y in the formula (II) is a phenylene group or a naphthalenediyl group.
    Type: Application
    Filed: July 16, 2010
    Publication date: May 17, 2012
    Applicant: TEIJIN CHEMICALS, LTD.
    Inventors: Kazunori Nunome, Manabu Matsui, Kazushi Tando, Teruyuki Shigematsu, Tetsuya Motoyoshi, Tomokiyo Doi
  • Polycarbonate and production method thereof
    Publication number: 20100048851
    Abstract: There is provided a polycarbonate which is excellent in both surface slipperiness and abrasion resistance. The polycarbonate is a polycarbonate which has a group having a siloxane structure and an aryl group at terminals in a specific ratio.
    Type: Application
    Filed: September 14, 2007
    Publication date: February 25, 2010
    Inventors: Toshiyuki Miyake, Tomokiyo Doi, Yuji Higaki