Patents by Inventor Kenichiroh Nagai

Kenichiroh Nagai 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).

  • Developing device, process cartridge and image forming apparatus that prevent toner leakage
    Patent number: 6212343
    Abstract: A developing device including a developing roller opposed to a photoconductor and rotatably mounted to a developing case of the developing device. A blade mounting surface is formed in an outer wall of the developing case, that is opposed to the photoconductor, and a blade holder, a blade and a supporting plate, that are laminated with each other, are mounted to the blade mounting surface of the developing case. A part of the blade opposite to a part of the blade sandwiched between the blade holder and the supporting member is elastically bent so as to contact an outer circumferential surface of the developing roller, and seal members are arranged at least along an edge of a longitudinal side of the blade holder at the side of the developing roller and along an edge of another longitudinal side of the blade holder at the opposite side of the developing roller, respectively, so as to increase airtightness of gaps between the blade holder and the outer wall of the developing case.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: April 3, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Hosokawa, Tetsuo Yamanaka, Kenetsu Osanai, Kenichiroh Nagai