Patent Number: 6,168,272

Title: Spectacle frame with elements of superelastic alloy

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 1/100 th of a millimeter per passage, or 40% of clod shrinking, followed by thermal beta treatment or directly by hot-forming.

Inventors: Larrue; Denis (Longchamois, FR)

Assignee: A. Lu. Tec. Association Lunetiere Technologique

International Classification: G02C 5/00 (20060101); G02C 001/00 ()

Expiration Date: 01/02/2018