Patents by Inventor Kiyoshi Doi

Kiyoshi Doi 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).

  • Exposure precision tester and exposure precision testing method for camera
    Patent number: 5895132
    Abstract: In an exposure precision tester for a camera, including a flexible wiring board where a photometric sensor is implemented is contained in a case. The case has an appearance similar to that of a film cartridge loaded by drop-in operation and is insertable into a film cartridge cell of the camera. Exposure test can be performed without a back lid because the photometric sensor measures and outputs the exposure energy in the state that the photometric sensor is positioned at a film mask portion by rotating an operation part of a feed shaft with the case being inserted in the camera.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: April 20, 1999
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Yasuo Asakura, Shinya Takahashi, Kiyoshi Doi, Akira Watanabe, Tadashi Ushiyama, Akira Inoue
  • Engine with mechanical governor
    Patent number: 5497747
    Abstract: A bearing boss (3) is protruded from a front wall (2) of a crankcase (1), and a crankshaft (4) is supported at its front journal portion (5) by this bearing boss (3). Interlocking shafts (7) are disposed within the crankcase (1) in parallel to the crankshaft (4), and a crank gear (6) and input gears (8) attached to the interlocking shafts (7) are arranged coplanarly. Balancer shafts (11) are used as the interlocking shafts (7), governor weights (9) are mounted to the rear surface (12) of the input gear (8), and a governor sleeve (10) is located behind the governor weights (9).
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: March 12, 1996
    Assignee: Kubota Corporation
    Inventors: Keiichi Nakano, Kiyoshi Doi, Kiyonobu Iida, Naoki Inoue
  • Camera body mount
    Patent number: 4239364
    Abstract: Bayonet-type attachment apparatus for coupling a lens or similar device to a camera wherein a one-piece, molded plastic annular camera body mount has tapered and resilient engagement claws which wedge, in the axial direction of the mount, between annularly parallel and oppositely facing engagement surfaces of the comating annular mount which is attached to the lens or similar device.
    Type: Grant
    Filed: October 23, 1978
    Date of Patent: December 16, 1980
    Inventor: Kiyoshi Doi
  • Apparatus for generating rotational power
    Patent number: 4220003
    Abstract: An apparatus comprises a pair of tanks, a pair of pistons, coupling means interconnecting the pair of pistons in balance, a closed chamber and a reservoir provided within each of the tanks and partitioned from each other by the piston, a nozzle disposed at one end of the closed chamber, a valve provided on each of the pistons, rotatable means and liquid feed channels. The nozzle, the rotatable means and the liquid feed channels are positioned substantially at the same level as or above the upper end of the reservoir in the tank to circulate the liquid. The apparatus generates rotational power with greatly reduced energy losses.
    Type: Grant
    Filed: March 30, 1979
    Date of Patent: September 2, 1980
    Inventor: Kiyoshi Doi