Patents by Inventor Andre C. Michaud

Andre C. Michaud 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).

  • Ophthalmic glasses with high indices of refraction
    Patent number: 4351906
    Abstract: The present invention is drawn to glasses suitable for the fabrication of segments or buttons for multifocal ophthalmic lenses. The inventive glasses have refractive indices ranging between about 1.745-1.771, an Abbe number greater than 29 for a refractive index of 1.771 and greater than 31 for a refractive index of 1.745, a softening point between about 640.degree.-700.degree. C., a coefficient of thermal expansion (25.degree.-300.degree. C.) between about 90-98.times.10.sup.-7 /.degree.C., and satisfactory chemical durability. The glasses consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 28-32.5 Na.sub.2 O 2-9 K.sub.2 O 0-4 Li.sub.2 O 0-1 K.sub.2 O + Na.sub.2 O + Li.sub.2 O 4-10.5 BaO 0-22 La.sub.2 O.sub.3 0-20 BaO + La.sub.2 O.sub.3 14-22 PbO 28.5-34 ZnO 0-4 TiO.sub.2 0-9 ZrO.sub.2 2-6.5 Nb.sub.2 O.sub.5 0-10 TiO.sub.2 + Nb.sub.2 O.sub.5 4.5-12 ZrO.sub.2 + TiO.sub.2 + Nb.sub.2 O.sub.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: September 28, 1982
    Assignee: Corning Glass Works
    Inventors: Jean E. Boudot, Jean P. Mazeau, Andre C. Michaud