Patents by Inventor Leon H. Fischer

Leon H. Fischer 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).

  • Method of marking plastic lenses
    Patent number: 4303701
    Abstract: A method of marking plastic lenses to selectively identify a lens by impregnating a fluorescent material into the surface of the lens so that when the lens is exposed to ultraviolet light it fluoresces.
    Type: Grant
    Filed: December 31, 1979
    Date of Patent: December 1, 1981
    Assignee: Buckbee-Mears Company
    Inventors: Daniel L. Torgersen, Leon H. Fischer