Patents by Inventor Hiroyuki Shirai

Hiroyuki Shirai 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).

  • Detachable two-frame process cartridge for an image forming apparatus
    Patent number: 5294960
    Abstract: A process cartridge detachably mountable to a main assembly of an image forming apparatus includes first and second frames. The first frame has an image bearing member and developing means for developing with a developer an electrostatic latent image formed on the image bearing member. The second frame is separable from the first frame and arranged for covering an upper part of the image bearing member, the second frame having developer accommodating means for accommodating developer to be supplied to the developer means.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: March 15, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiya Nomura, Tadayuki Tsuda, Shinichi Sasaki, Isao Ikemoto, Kazushi Watanabe, Hiroyuki Shirai, Toshiyuki Karkama
  • Process cartridge detachably mountable to image forming apparatus featuring an injectable sealing member
    Patent number: 5208634
    Abstract: A process cartridge detachably mountable to an image forming apparatus includes a device contributable for forming an image; a developer accommodator; and a sealing member between the image forming device and the developer accommodator, wherein the sealing member is provided by injecting a liquid material which becomes an elastomer when it is solidified.
    Type: Grant
    Filed: April 23, 1991
    Date of Patent: May 4, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Isao Ikemoto, Tadayuki Tsuda, Kazushi Watanabe, Kazuhiko Ishiwata, Kazuo Shishido, Kanji Yano, Makoto Tanaka, Shinichi Sasaki, Toshiyuki Karakama, Hiroyuki Shirai
  • Toner seal for developing unit in process cartridge
    Patent number: 5134960
    Abstract: A developing apparatus includes an elastic blade contacted to a developing roller to regulate a thickness of a layer of a developer to be formed on the developing roller. To the longitudinal end portions of the developing roller, seals are press-contacted to prevent leakage of the developer. Each of the seals has a projection toward the longitudinally central portion of the developing roller. The projection is overlaid on the blade at a position where the blade and the developing roller are contacted.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: August 4, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Shirai
  • Internal shoe drum brake adjuster with mechanically operated brake
    Patent number: 4079819
    Abstract: An improved adjuster for a shoe drum brake comprising a strut of adjustable length extending between one of the brake shoes and an arm of an operating lever that is actuated by a hand brake. The strut has a threaded part or spindle and a ratchet threadedly engaging with the threaded part. The adjuster also comprises a pawl arm carried by the arm of the operating lever and having a pawl cooperating with the ratchet. The arm of the operating lever is formed with a nose positioned for engagement with the other one of the brake shoes. The threaded part of the strut is formed with a stopper which is adapted to engage with the ratchet to define the minimum length of the strut.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: March 21, 1978
    Assignee: Nissan Motor Company, Ltd.
    Inventors: Hiroyuki Shirai, Atushi Fujii, Yoshiyuki Natori