Patents by Inventor Paul T. Ihn

Paul T. Ihn 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 ophthalmic lens and method of manufacture
    Patent number: 5152788
    Abstract: A multifocal ophthalmic lens includes first and second lens members. Each lens member has a smooth outer surface and an inner surface with an edge about its perimeter. A multifocal diffractive zone plate on at least one of the lens members is characterized by an index of refraction. The lens members are joined at the edges by ultrasonic welding to form a cavity adjacent the diffractive zone plate. The cavity is filled with a liquid medication having an index of refraction which is different than the index of refraction of the diffractive zone plate. A hole through one of the lens members functions as a fluid transport mechanism to permit transfer of the medication between the cavity and eye.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: October 6, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William B. Isaacson, John A. Futhey, Kent D. Thompson, Paul T. Ihn
  • Lens molding apparatus and method
    Patent number: 4865779
    Abstract: A mold and method is disclosed for the production of a lens that can be placed in or on the eye. The mold employs an inflexible ridge, preferably having a triangular cross section, on one of the mold parts. The ridge contacts the other mold part along an annular line.
    Type: Grant
    Filed: December 15, 1987
    Date of Patent: September 12, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Paul T. Ihn, Larry R. Boughten