Patents by Inventor Jiro Ichikawa

Jiro Ichikawa 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).

  • High-hardness precipitation hardening steel for metallic mold
    Patent number: 5639421
    Abstract: A precipitation hardening steel excellent in machinability, toughness (10J/cm.sup.2 or above), hardness (HRC43 or above) after aging treatment and suitable to a metallic mold for plastics, which consists by weight percentage of C: 0.05-0.18%, Si:0.15-1.00%, Mn:1.0-2.0%, Ni:2.5-3.5%, Cr:0.7-2.0%, Al:0.5-1.5%, Cu:0.7-1.7%, Mo:0.1-0.4%, S:0.05-0.35%, and the balannce of Fe, and H-value obtained through the following equation indicates zero or a positive value:H=(3.843 Mn+4.378 Cr.sup.0.58)-(4.220 S+8.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: June 17, 1997
    Assignee: Daido Tokushuko Kabushhiki Kaisha
    Inventors: Jiro Ichikawa, Toshihiro Kitagawa
  • Process for preparing a flexible composite material
    Patent number: 5076872
    Abstract: A flexible composite material comprising a core composed of a blend of a thermoplastic resin fiber and a reinforcing fiber, and a flexible sleeve formed of a thermoplastic resin and surrounding the core is prepared by intermixing a thermoplastic resin fiber and a reinforcing fiber to obtain a core, and then extruding a thermoplastic resin over the core.
    Type: Grant
    Filed: June 9, 1988
    Date of Patent: December 31, 1991
    Assignees: Fuji Standard Research, Inc., Fuji Oil Co., Ltd., Across Co., Ltd.
    Inventors: Takao Nakagawa, Hiroyuki Uchino, Mihoko Yamashita, Jiro Ichikawa
  • Flexible composite material and process for preparing same
    Patent number: 4770915
    Abstract: A flexible composite material comprising a core composed of a blend of a thermoplastic resin fiber and a reinforcing fiber, and a flexible sleeve formed of a thermoplastic resin and surrounding the core. The composite material may be prepared by intermixing a thermoplastic resin fiber and a reinforcing fiber to obtain a core, and then extruding a thermoplastic resin over the core.
    Type: Grant
    Filed: December 9, 1986
    Date of Patent: September 13, 1988
    Assignees: Fuji Standard Research Inc., Daido Steel Co., Fuji Oil Co., Ltd
    Inventors: Takao Nakagawa, Hiroyuki Uchino, Mihoko Yamashita, Jiro Ichikawa