Patents Assigned to Kabushiki Kaish Ohara
  • Optical glass
    Patent number: 7528083
    Abstract: An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (? d) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and an mean coefficient of linear thermal expansion (?) within a range from 80×10?7° C.?1 to 103×10?7° C.?1, comprising SiO2, TiO2, Nb2O5 and Li2O and being substantially free of a Pb compound.
    Type: Grant
    Filed: June 2, 2004
    Date of Patent: May 5, 2009
    Assignee: Kabushiki Kaish Ohara
    Inventors: Koji Shimizu, Susumu Uehara