Patents by Inventor Koujiro Takano

Koujiro Takano 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).

  • Polypropylene-laminated steel sheet
    Patent number: 5837360
    Abstract: A polypropylene-laminated steel sheet is provided which is less liable to cause whitening on receiving impact shock and is superior in resistance to corrosion. A process for producing the polypropylene-laminated steel sheet is also provided. The polypropylene-laminated steel sheet comprises, at least on one side of the steel sheet, a layer (A) of modified polypropylene grafted with an unsaturated carboxylic acid, and, if desired, a layer (B) of polypropylene formed additionally on the layer (A), the modified polypropylene of the layer (A) and the polypropylene of the layer (B) having crystallinity of not more than 55%.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: November 17, 1998
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Koujiro Takano, Mamoru Ishii, Masaharu Mito, Satoshi Akiyama
  • Polypropylene-laminated steel sheet and production thereof
    Patent number: 5516397
    Abstract: A polypropylene-laminated steel sheet is provided which is less liable to cause whitening on receiving impact shock and is superior in resistance to corrosion. A process for producing the polypropylene-laminated steel sheet is also provided. The polypropylene-laminated steel sheet comprises, at least on one side of the steel sheet, a layer (A) of modified polypropylene grafted with an unsaturated carboxylic acid, and, if desired, a layer (B) of polypropylene formed additionally on the layer (A), the modified polypropylene of the layer (A) and the polypropylene of the layer (B) having crystallinity of not more than 55%.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: May 14, 1996
    Assignees: Nippon Steel Corporation, Mitsui Petrochemical Industries, Ltd.
    Inventors: Koujiro Takano, Mamoru Ishii, Masaharu Mito, Satoshi Akiyama