Patents Assigned to A. Lu. Tec. Association Lunetiere Technologique
  • Patent number: 6168272
    Abstract: The invention concerns a frame for spectacles comprising at least one element made of polycrystalline copper—aluminum—beryllium (Cu—Al—BE) of elasticity between 3 and 6%, preferably of the order of 4%. The polycrystalline alloy composition is 0.5% to 1% of beryllium, 11% to 12% of aluminum, the remainder being copper. The polycrystalline alloy average grain size is less than 0.12 mm. The Cu—Al—BE element is formed by several shrinking operations not exceeding deformation of {fraction (1/100)} th of a millimeter per passage, or 40% of clod shrinking, followed by thermal beta treatment or directly by hot-forming.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: January 2, 2001
    Assignee: A. Lu. Tec. Association Lunetiere Technologique
    Inventor: Denis Larrue