Patents by Inventor Keiichi Nagata

Keiichi Nagata 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).

  • Sensor for measuring velocity of vibration using light waveguide
    Patent number: 7262834
    Abstract: This invention provides a device or method for measuring vibration with high sensitivity and over a wide bandwidth. A curved section is formed in an optical fiber. The curved section is disposed on a place to be measured. Light is input in the optical fiber, and then variation of frequency between the input light and the output light is detected. Infinitesimal vibration applied to the curved section can be measured as variation of frequency between the input light and the output light. Further, it is possible to measure vibration over a wide bandwidth.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: August 28, 2007
    Assignee: Toudai Tlo, Inc.
    Inventors: Kazuro Kageyama, Isamu Ohsawa, Makoto Kanai, Yukiya Tsuchida, Keiichi Nagata
  • Vibration measurement device and vibration measurement method
    Publication number: 20060152735
    Abstract: This invention provides a device or method for measuring vibration with high sensitivity and over a wide bandwidth. A curved section is formed in an optical fiber. The curved section is disposed on a place to be measured. Light is input in the optical fiber, and then variation of frequency between the input light and the output light is detected. Infinitesimal vibration applied to the curved section can be measured as variation of frequency between the input light and the output light. Further, it is possible to measure vibration over a wide bandwidth.
    Type: Application
    Filed: December 23, 2003
    Publication date: July 13, 2006
    Inventors: Kazuro Kageyama, Isamu Ohsawa, Makoto Kanai, Yukiya Tsuchida, Keiichi Nagata
  • Maleic acid-modified polyolefin and process for the preparation of the same
    Patent number: 4751270
    Abstract: A maleic acid-modified polyolefin prepared by graft polymerization of maleic anhydride to polyolefin in the presence of a compound having the formula (I): ##STR1## in which each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently an alkyl group having 1-6 carbon atoms; and each of X and Y is independently any one of the hydrogen atom, an alkyl group having 1-6 carbon atoms and a halogen atom. A process for the preparation of said maleic acid-modified polyolefin is also disclosed.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: June 14, 1988
    Assignee: Ube Industries, Ltd.
    Inventors: Shotaro Urawa, Keiichi Nagata, Noboru Yamaguchi