Patents Examined by Frank W. Mign
  • Method of making hardened ophthalmic lenses by ion exchange
    Patent number: 4036623
    Abstract: Ophthalmic lenses formed of ophthalmic glass and having accurately finished front and back curved surfaces and edged to the shapes desired are heated in molten salt bath and ion-exchange hardened on all surfaces thereof so as to satisfy high safety standards while being substantially free from optical image distortions for objects viewed therethrough. The invention includes method and apparatus for rapid and controlled pre-heating, soaking and cooling steps of lenses relatively cheaply and in sizable numbers at the same time.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: July 19, 1977
    Assignee: American Optical Corporation
    Inventors: Emil W. Deeg, Richard D. Courtemanche