Patents by Inventor Toshio Ohkawa

Toshio Ohkawa 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).

  • Crosslinkable rubber composition
    Patent number: 6949606
    Abstract: A rubber composition comprising a combination of a nitrile rubber and an epilhalohydrin rubber is cross-linked to give a crosslinked product, by using at least two kinds of crosslinking agents selected from a sulfur-containing crosslinking agent, a mercaptotriazine crosslinking agent and a 2,3-dimercaptoquinoxaline crosslinking agent.
    Type: Grant
    Filed: January 26, 2000
    Date of Patent: September 27, 2005
    Assignee: Zeon Corporation
    Inventors: Koichi Nishimura, Toshio Ohkawa, Hideo Fukuda
  • Rubber composition for hose and hose
    Patent number: 6699936
    Abstract: A rubber composition for a hose, which comprises a nitrile rubber (A) comprising 45-55 weight % of &agr;,&bgr;-ethylenically unsaturated nitrile monomer units and 55-45% by weight of conjugated diene monomer units, an epihalohydrin rubber (B), and a crosslinking agent (CA) for the nitrile rubber and/or a crosslinking agent (CB) for the epihalohydrin rubber; the amount of nitrile rubber (A) being 25-80 weight % based on the sum of nitrile rubber (A) and epihalohydrin rubber (B); and a hose having a layer comprised of a crosslinked product of the rubber composition. The hose has excellent resistance to fuel oil permeation and cold resistance, and therefore, it is especially suitable as fuel oil hoses of an automobile.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: March 2, 2004
    Assignee: Zeon Corporation
    Inventors: Koichi Nishimura, Shigeru Fujita, Toshio Ohkawa
  • Method of sintering stainless steel powder
    Patent number: 4552719
    Abstract: A stainless steel powder is mixed with at least a Ni--Mn and a Ni--Cr powder, and the powder mixture is formed by loose packing into a required configuration. The powder mixture is sintered in a non-oxidizing atmosphere at the melting point of the Ni--Mn powder or at a higher temperature thereby to obtain a porous body.
    Type: Grant
    Filed: August 31, 1983
    Date of Patent: November 12, 1985
    Assignee: N.D.C. Co., Ltd.
    Inventors: Toru Morimoto, Tsuyoshi Ohsaki, Toshio Ohkawa, Masahito Fujita
  • Porous body of aluminum or its alloy and a manufacturing method thereof
    Patent number: 4283465
    Abstract: A porous sintered material of good permeability and effective sound absorbability, being formed by combining between particles of aluminum or aluminum alloy powder into a body by means of sintering and having connecting pores among the particles of said aluminum or aluminum alloy powder. Said porous sintered material is obtained by mixing aluminum or an aluminum alloy with a low melting point aluminum alloy, forming the mixture into the predetermined shape and sintering it at a temperature which is at least 10.degree. C. lower than the melting point of the base material and higher than that of the low melting point material.
    Type: Grant
    Filed: August 23, 1978
    Date of Patent: August 11, 1981
    Assignee: Nippon Dia Clevite Co., Ltd.
    Inventors: Toru Morimoto, Tsuyoshi Ohsaki, Toshio Ohkawa, Kenji Matsuzawa
  • Surface treatment of rubber articles with an alkyl hypohalite
    Patent number: 3940548
    Abstract: A process for treating the surfaces of shaped articles of rubber, which comprises contacting the surfaces of shaped articles of rubber containing carbon-to-carbon unsaturated double bonds, with an alkyl hypohalite.
    Type: Grant
    Filed: February 26, 1974
    Date of Patent: February 24, 1976
    Assignee: Nippon Zlin Co. Ltd.
    Inventors: Yoshihiro Todani, Toshio Ohkawa