Patents by Inventor Akihiko Chigami

Akihiko Chigami 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).

  • Polyvinyl alcohol film, and polarizing film and polarizing plate using the same
    Patent number: 9085664
    Abstract: The present invention provides a polyvinyl alcohol film which has a width of 3 m or more, an in-plane retardation value of 30 nm or less and a fluctuation of in-plane retardation value of 15 nm or less.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: July 21, 2015
    Assignee: The Nippon Synthetic Chemical Industry Co., Ltd.
    Inventors: Hideki Oono, Akihiko Chigami, Seiichirou Hayakawa
  • POLYVINYL ALCOHOL FILM AND POLARIZING FILM AND POLARIZING PLATE USING THE SAME
    Publication number: 20110227248
    Abstract: The present invention provides a polyvinyl alcohol film which has a width of 3 m or more, an in-plane retardation value of 30 nm or less and a fluctuation of in-plane retardation value of 15 nm or less.
    Type: Application
    Filed: May 26, 2011
    Publication date: September 22, 2011
    Applicant: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO. LTD
    Inventors: Hideki OONO, Akihiko CHIGAMI, Seiichirou HAYAKAWA
  • Polyvinyl alcohol film and polarizing film and polarizing plate using the same
    Patent number: 7674518
    Abstract: The present invention provides a polyvinyl alcohol film having a correlation length of 200 nm or less, the correlation length being derived from the result of light scattering measurement using a He—Ne laser having a wavelength of 633 nm as a light source.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: March 9, 2010
    Assignee: The Nippon Synthetic Chemical Industry Co., Ltd.
    Inventors: Seiichirou Hayakawa, Syuichi Kitamura, Yukari Nishimoto, Akihiko Chigami
  • Polyvinyl Alcohol Film and Process for Producing the Same
    Publication number: 20080113173
    Abstract: The present invention provides a polyvinyl alcohol film having a film thickness of 30 to 70 ?m and a kinetic friction coefficient against a stainless-steel roll of 0.03 or less and a process for producing a polyvinyl alcohol film.
    Type: Application
    Filed: November 1, 2005
    Publication date: May 15, 2008
    Applicant: The Nippon Synthetic Chemical Industry Co., Ltd.
    Inventors: Seiichirou Hayakawa, Katsuhiko Katsuma, Akihiko Chigami
  • Polyvinyl Alcohol Film, and Polarizing Film and Polarizing Plate Using the Same
    Publication number: 20070298234
    Abstract: The present invention provides a polyvinyl alcohol film which has a width of 3 m or more, an in-plane retardation value of 30 nm or less and a fluctuation of in-plane retardation value of 15 nm or less.
    Type: Application
    Filed: December 19, 2005
    Publication date: December 27, 2007
    Applicant: The Nippon Synthetic Chemical Industry Co., Ltd.
    Inventors: Hideki Oono, Akihiko Chigami, Seiichirou Hayakawa
  • Polyvinyl Alcohol Film and Polarizing Film and Polarizing Plate Using the Same
    Publication number: 20070295945
    Abstract: The present invention provides a polyvinyl alcohol film having a correlation length of 200 nm or less, the correlation length being derived from the result of light scattering measurement using a He—Ne laser having a wavelength of 633 nm as a light source.
    Type: Application
    Filed: December 19, 2005
    Publication date: December 27, 2007
    Applicant: The Nippon Synthetic Chemical Industry Co., Ltd.
    Inventors: Seiichirou Hayakawa, Syuichi Kitamura, Nishimoto Yukari, Akihiko Chigami