Patents by Inventor Takehiro Koizumi

Takehiro Koizumi 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).

  • LENS BARREL
    Publication number: 20210181458
    Abstract: A lens barrel capable of increasing the moving range of a lens includes: a lens retainer frame for holding a lens; a drive unit for driving the lens retainer frame along the optical axis direction; a first cylinder that holds the drive unit and has a cam follower; a second cylinder that has a cam groove for engaging the cam follower; and a bias part for biasing the first cylinder along the optical axis.
    Type: Application
    Filed: June 4, 2019
    Publication date: June 17, 2021
    Applicants: NIKON CORPORATION, TOCHIGI NIKON CORPORATION
    Inventors: Kunihiko SHIMIZU, Satoshi WAIZUMI, Takehiro KOIZUMI
  • Lubricating grease
    Patent number: 4802999
    Abstract: Lubricating grease having high dropping point, superior stability against oxidation and long life is obtained by having a thickener contained in grease, said thickener comprising the three components:a. lithium soap of C.sub.12-24 hydroxyfatty acid,b. lithium phosphate salt produced from phosphoric or phosphorous acid ester andc. dilithium borate.
    Type: Grant
    Filed: March 2, 1988
    Date of Patent: February 7, 1989
    Assignee: Shell Oil Company
    Inventors: Takehiro Koizumi, Hideo Matsuzawa