Patents by Inventor Ricky L. Neby

Ricky L. Neby 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).

  • Multifocal diffractive lens
    Patent number: 4830481
    Abstract: A multifocal ophthalmic lens has a plurality of concentric diffractive zones with adjacent zones separated by steps having predetermined heights. Each step has an outer corner and each outer corner has a radius of curvature equal to at least one half the height of the step associated therewith.
    Type: Grant
    Filed: August 12, 1988
    Date of Patent: May 16, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John A. Futhey, William B. Isaacson, Ricky L. Neby