Patents by Inventor Youhei Okada

Youhei Okada 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).

  • Polycarbonate resin and optical film
    Patent number: 9850344
    Abstract: Provided are a polycarbonate resin and an optical film formed therefrom, having wavelength dispersion characteristics close to the ideal broad bandwidth, excellent durable stability and flexibility, high retardation developability, a low photoelastic constant, and excellent melt processability.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: December 26, 2017
    Assignee: TEIJIN LIMITED
    Inventors: Tetsuya Motoyoshi, Youhei Okada, Kouji Oda, Katsuhiro Yamanaka
  • POLYCARBONATE RESIN AND OPTICAL FILM
    Publication number: 20160326311
    Abstract: Provided are a polycarbonate resin and an optical film formed therefrom, having wavelength dispersion characteristics close to the ideal broad bandwidth, excellent durable stability and flexibility, high retardation developability, a low photoelastic constant, and excellent melt processability, comprising: a unit (A) represented by the following formula: [wherein R1 and R2 each independently represent a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms optionally containing an aromatic group, or a halogen atom, and m and n each independently represent an integer of 0 to 4], a unit (B) represented by the following formula: [wherein R3 and R4 each independently represent a hydrogen atom, hydrocarbon group having 1 to 10 carbon atoms optionally containing an aromatic group, or a halogen atom, R5 and R6 each independently represent a hydrocarbon group having 1 to 10 carbon atoms optionally containing an aromatic group, s and t each independently represent an integer of 0 to 4, an
    Type: Application
    Filed: March 13, 2015
    Publication date: November 10, 2016
    Applicant: TEIJIN LIMITED
    Inventors: Tetsuya Motoyoshi, Youhei Okada, Kouji Oda, Katsuhiro Yamanaka