Patents by Inventor Shigeo Murayama

Shigeo Murayama 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).

  • Process cartridge and electrophotographic image forming apparatus
    Publication number: 20050069338
    Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the main assembly including an output contact movable between an electrical connecting position and a retracted position retracted from the electrical connecting position, a displaceable member for moving the output contact, and an elastic function member for elastically urging the displaceable member to urge the output contact toward the retracted position away from the electrical connecting position, the process cartridge includes an electrophotographic photosensitive drum; process means actable on the electrophotographic photosensitive drum; a movable operation member movable relative to a cartridge frame, wherein when the process cartridge is inserted into the main assembly of the apparatus, the movable operation member is engageable with a fixed engageable member fixed in the main assembly of the apparatus to move relative to the cartridge frame, and is engageable with a displaceable engaging po
    Type: Application
    Filed: December 31, 2003
    Publication date: March 31, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Toru Oguma, Shigeo Murayama, Daisuke Abe, Hideyuki Matsubara
  • Process cartridge with axially shiftable drive coupling
    Patent number: 6035159
    Abstract: An electrophotographic image forming apparatus which forms an image on a recording medium and to which a process cartridge can detachably be mounted includes (a) a cartridge mounting portion capable of detachably mounting a process cartridge including an electrophotographic photosensitive drum, a process device acting on the photosensitive drum, and a projection having a first-twisted-polygonal prism shape provided on one longitudinal end of the photosensitive drum, (b) a rotatable rotary member having a first twisted hole of polygonal cross-section, (c) a rotatable coupling shaft supported for axial movement and being provided at its one end with a second-twisted-polygonal prism shape fitted into the first twisted hole of the rotary member, and being provided at its other end with a second twisted hole of polygonal cross-section for engaging with and disengaging from the projection having the first-twisted-polygonal prism shape and having substantially the same twisted angle and twisted direction as those of
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: March 7, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jun Azuma, Takashi Goto, Masaaki Nishikawa, Shigeo Murayama