Patents by Inventor Pierre Melard

Pierre Melard 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).

  • Cerium/rare earth polishing compositions
    Patent number: 4786325
    Abstract: Glass polishing compositions, advantageously recycled into glassmaking formulations, are comprised of suspension of particulate ceric oxide and at least one colorless oxide of a lanthanide or yttrium rare earth, preferably an oxide of lanthanum, samarium, europium, gadolinium, dysprosium, thulium, ytterbium, lutecium, yttrium, or mixtures thereof.
    Type: Grant
    Filed: July 21, 1986
    Date of Patent: November 22, 1988
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Pierre Melard, Francis Tastu
  • Ceric oxide/cerous salt organic glass polishing compositions
    Patent number: 4769073
    Abstract: Cerium-based polishing compositions, well adapted for the rapid and efficient polishing of organic glass surfaces, e.g., plastic ophthalmic lenses and plastic sheet material, are comprised of intimate admixture of particulate ceric oxide and a water soluble cerous salt.
    Type: Grant
    Filed: September 28, 1987
    Date of Patent: September 6, 1988
    Assignee: Rhone-Poulenc Chimie
    Inventors: Francis Tastu, Pierre Melard
  • Cerium based glass polishing compositions
    Patent number: 4601755
    Abstract: Cerium based glass polishing compositions, well adapted for the polishing, e.g., of optical glass, are comprised of (i) at least one crystalline phase of CeO.sub.2 type, and (ii) a crystalline phase which comprises a rare earth pyrosilicate having the formula Ln.sub.2-x Ce.sub.x Si.sub.2 O.sub.7, wherein Ln is at least one lanthanide or yttrium and x is a number ranging from zero to less than 2.
    Type: Grant
    Filed: July 30, 1984
    Date of Patent: July 22, 1986
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Pierre Melard, Marcel Peltier, Francis Tastu