Patents by Inventor Etsuzou Kurihara

Etsuzou Kurihara 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).

  • Structural combination of plastic lenses
    Patent number: 5024509
    Abstract: The invention provides a compound lens constituted by a couple of lenses fitted with each other at contact surfaces, in which at least one of lenses is made of plastic. Each of the couple of lenses has a cylinder-shape projection on its periphery. An inner cylinder surface of one cylinder-shape projection and an outer cylinder surface of the other cylinder-shape projection are made to form an inlaying part. At least three engaging points are provided evenly around the circumference in the inlaying part to cause frictional force to prevent the compound lens from being splitted.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: June 18, 1991
    Assignee: Konica Corporation
    Inventor: Etsuzou Kurihara