Patents by Inventor Robert K. Graham

Robert K. Graham 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).

  • Hybrid corneal contact lens
    Patent number: 4166255
    Abstract: A hybrid corneal contact lens comprising a substantially rigid central optical area surrounded by and/or embedded in a relatively soft transparent plastic component, and methods of constructing the same, the lens having the unique features of retaining the optical configuration imparted to the central optical portion, yet possessing a flexible feather-edged periphery, thereby providing a safer and more comfortable fit for the eye.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: August 28, 1979
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert K. Graham