Patents by Inventor Hideaki Nitta

Hideaki Nitta 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).

  • Film of aromatic polyethersulfone process for the production thereof and solution composition for the production thereof
    Patent number: 5645766
    Abstract: An optically isotropic film of an aromatic polyethersulfone, which is useful as a substrate for a liquid crystal display device, and an optically anisotropic, uniaxially oriented film of an aromatic polyethersulfone, which is useful as a phase difference plate for a liquid crystal display device. The optically isotropic film is produced by casting an aromatic polyethersulfone solution composition comprising 15 to 40 parts by weight of a solvent which contains at least 60% by weight of 1,3-dioxolane and can dissolve an aromatic polyethersulfone and 10 parts by weight of the aromatic polyethersulfone, on a substrate, and heating the cast solution composition containing a solvent to evaporate the solvent off.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: July 8, 1997
    Assignee: Teijin Limited
    Inventors: Takashi Shiro, Kaoru Iwata, Hideaki Nitta, Takeshi Sasaki, Utami Yonemura
  • Polycarbonate film for optical purposes and a production process thereof
    Patent number: 5561180
    Abstract: The present invention is to provide polycarbonate film excellent in optical properties such as high transparency and a process for producing it. The present invention relates to polycarbonate film having a specific retardation values, and a process for producing polycarbonate film by casting a dope onto a support and evaporating the solvent with heat wherein the dope is prepared by dissolving 10 parts by weight of polycarbonate resin in 30 to 150 parts by weight of the solvent mixture which contains more than 60% by weight of dioxolane.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: October 1, 1996
    Assignee: Teijin Limited
    Inventors: Yutaka Taketani, Kaoru Iwata, Hideaki Nitta, Utami Yonemura, Takeshi Sasaki
  • Polycarbonate film for optical purposes and a production process thereof
    Patent number: 5478518
    Abstract: The present invention is to provide a polycarbonate film excellent in optical properties such as high transparency and a process for producing it. The present invention relates to a polycarbonate film having a specific retardation value, and a process for producing a polycarbonate film by casting a dope onto a support and evaporating the solvent with heat wherein the dope is prepared by dissolving 10 parts by weight of polycarbonate resin in 30 to 150 parts by weight of the solvent mixture which contains more than 60% by weight of dioxolane.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: December 26, 1995
    Assignee: Teijin Limited
    Inventors: Yutaka Taketani, Kaoru Iwata, Hideaki Nitta, Utami Yonemura, Takeshi Sasaki