Patents by Inventor Koichi Takashima

Koichi Takashima 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).

  • Electrophotographic toner and process for producing the same
    Patent number: 5312710
    Abstract: An electrophotographic toner comprising toner particles having adhered on the surface thereof a polymer comprising a monomer unit derived from a fluorine-containing vinyl monomer represented by formula (I) or (II): ##STR1## wherein X represents --COO--, --OCO--, --O--, or a p-phenylene group; R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms; m represents an integer of from 1 to 7; n represents an integer of from 1 to 19; o and p each represent an integer of from 0 to 7; and Y represents a hydrogen atom or a fluorine atom.The toner exhibits satisfactory charging stability against the environment or mechanical forces while having a narrow charge distribution. It can be prepared with a wide choice of materials and without requiring any special reaction apparatus.
    Type: Grant
    Filed: June 30, 1992
    Date of Patent: May 17, 1994
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kazufumi Tomita, Yoshihiro Inaba, Koichi Takashima, Tsutomu Kubo, Izuru Matsui
  • Electrophotographic toner
    Patent number: 5215851
    Abstract: A toner comprising capsule particles composed of a core and an outer shell wherein the capsule particles have at least a substance capable of forming a radical at the surface thereof, and the capsule particles have adhered on the outer shell a copolymer comprising a hydrophilic vinyl monomer unit and a hydrophobic vinyl monomer unit. The toner exhibits stable chargeablity against environmental changes with a narrow charge distribution.
    Type: Grant
    Filed: September 4, 1991
    Date of Patent: June 1, 1993
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kazufumi Tomita, Yoshihiro Inaba, Koichi Takashima
  • Single-component developing method
    Patent number: 4923777
    Abstract: A single-component developing method with the steps of forming a uniform developer layer and developing an electrostatic latent image. The uniform developer layer is formed by abutting a layer regulating member made of a plate of soft, elastic material against a developer carrier and by regulating the developer layer by urging at least one end edge on a portion of the layer regulating member against the devloper carrier. The electrostatic latent image is formed on a photosensitive material and is developed by moving a portion of the developer carrier with the uniform developer layer formed thereon opposite the photosensitive material.
    Type: Grant
    Filed: August 25, 1988
    Date of Patent: May 8, 1990
    Assignee: Fuji Xerox Co, Ltd.
    Inventors: Takashi Imai, Susumu Saito, Koichi Takashima
  • Blood purification system
    Patent number: 4372846
    Abstract: The invention relates to a blood purification system especially useful as an artificial kidney system. When the blood of the patient is purified by a filter, the volume of filtrate from the filter is measured accurately and the volume of a substitution fluid supplied to the patient is measured accurately. The blood is purified while the two volumes are being maintained in balance accurately.
    Type: Grant
    Filed: March 16, 1981
    Date of Patent: February 8, 1983
    Assignee: Daicel Chemical Industries Ltd.
    Inventors: Seiji Yamagami, Hirohiko Nonaka, Tuneyoshi Shimonaru, Koichi Takashima, Yasuhiko Kato