Patents by Inventor Frederick M. Kraft

Frederick M. Kraft 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).

  • Eye testing device for prescribing eyeglasses
    Patent number: 4129361
    Abstract: A device for determining a prescription lens for eyeglasses to be used by highly hyperopic patients, in which a frame mounted lens is inserted in a trial lens mounting to project on either side of the frame with one surface of the lens formed with an aspherical convex curvature and the other surface of the lens being concave and formed with a spherical curvature.
    Type: Grant
    Filed: March 10, 1977
    Date of Patent: December 12, 1978
    Inventors: Peter A. Bacotti, Frederick M. Kraft