Patents by Inventor Alexander F. Menyhart

Alexander F. Menyhart 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
  • Preparation of photochromic gradient lenses
    Patent number: 4154590
    Abstract: Glass lenses or lens blanks, containing all the ingredients necessary to produce phototropic or photochromic behavior, are treated in a conventional production furnace to produce a locally variable heat treatment, wherein at least one portion thereof is raised to a temperature exceeding the glass strain point but not the softening point, and other portions are heated to variable temperatures decreasing from the strain point. The treatment causes development of phototropic or photochromic behavior only in those portions of the lenses or lens blanks exposed to the temperature above the strain point.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: May 15, 1979
    Assignee: American Optical Corporation
    Inventor: Alexander F. Menyhart