Patents Examined by Hellen L. Pezzuto
  • Lowly birefringent polymer, process for the production thereof, and optical pickup lens
    Patent number: 6262214
    Abstract: A copolymer having low birefringence substantially consisting of a repeating unit represented by the following general formula (1) and a repeating unit of a (meth)acrylate: wherein, R1 represents a hydrogen atom or a hydrocarbon group having 1 to 25 carbon atoms, an alicyclic hydrocarbon group or a substituted hydrocarbon group.). This copolymer has low birefringence and low hydrophilia, is excellent in transparency, heat-resistance and mechanical strength, and can be applied to lenses, optical disks, optical fibers and the like.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: July 17, 2001
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Akira Yanagase, Seiji Tone, Toru Tokimitsu