Patents by Inventor James Duszlak

James Duszlak 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).

  • Blocking shim and method for prescription-laboratory processing of aspheric progressive-addition lenses
    Patent number: 4942696
    Abstract: A thin sheet of flexible material shaped like an inverted "T", is applied to the aspheric distance portion of a progressive-addition ophthalmic lens, to provide stable three-point contact for blocking the lens prior to second-side surfacing in the prescription laboratory.
    Type: Grant
    Filed: June 9, 1988
    Date of Patent: July 24, 1990
    Assignee: American Optical Corporation
    Inventors: John T. Winthrop, Alexander F. Menyhart, James Duszlak