Patents by Inventor Michitaka Tsuru

Michitaka Tsuru 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).

  • Phosphate base laser glasses
    Patent number: 4239645
    Abstract: A phosphate base laser glass comprising 55-70% P.sub.2 O.sub.5, 1-15% Al.sub.2 O.sub.3, 0-25% Li.sub.2 O, 0-25% Na.sub.2 O, 0-8% K.sub.2 O, the total proportion of Li.sub.2 O, Na.sub.2 O, and K.sub.2 O being 10-25%, 0-15% BaO, 0-15% ZnO, 0-15% CaO, 0-15%, SrO, 0-15% MgO, the total proportion of BaO, ZnO, CaO, SrO, and MgO being 5-15%, 0-5% Y.sub.2 O.sub.3, 0-5% La.sub.2 O.sub.3, 0-5% GeO.sub.2, 0-5% CeO.sub.2, 0-3% Nb.sub.2 O.sub.5, 0-3% MnO.sub.2, 0-2% Ta.sub.2 O.sub.5, 0-1% Sb.sub.2 O.sub.3, and 0.01-5% Nd.sub.2 O.sub.3, all % being mole %.The phosphate base laser glass of this invention has a high induced emission cross section, a low non-linear refractive index coefficient, and excellent acid resistance and divitrification resistance. By replacing partially or wholely one or more of LiO.sub.2, Na.sub.2 O, K.sub.2 O, BaO, ZnO, CaO, SrO, MgO or Al.sub.2 O.sub.3 by LiF, NaF, KF, BaF.sub.2 ZnF.sub.2, CaF.sub.2, SrF.sub.2, MgF.sub.2 or AlF.sub.
    Type: Grant
    Filed: March 17, 1976
    Date of Patent: December 16, 1980
    Assignee: Hoya Glass Works, Ltd.
    Inventors: Tetsuro Izumitani, Michitaka Tsuru