Patents by Inventor Joel Kauffman

Joel Kauffman 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).

  • Compounds that absorb ultraviolet light, methods of their preparation and optical lenses containing them
    Patent number: 7713452
    Abstract: Compounds that absorb ultraviolet light 380 nm to 400 nm range but avoid absorption in the blue light range, thereby imparting yellowness, i.e., 410-420 nm have suitable refractive characteristics useful in the preparation of optical resins or plastics suitable, for example, for the manufacture of ophthalmic lenses. Methods for making the compounds, optic lenses containing the compounds, and methods for making these are also described.
    Type: Grant
    Filed: December 30, 2005
    Date of Patent: May 11, 2010
    Assignee: Essilor International Compagnie Generale d'Optique
    Inventors: Joel Kauffman, Peter T. Litak, Martin Rickwood