Patents by Inventor Kunitoshi Ishihara

Kunitoshi Ishihara 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).

  • Solid golf balls and method of making
    Patent number: 6582325
    Abstract: A solid golf ball has a solid core and a cover formed of a resin composition comprising the reaction product of a thermoplastic polyurethane elastomer with dicyclohexylmethane-4, 4″-diisocyanate. The ball is efficiently moldable and meets such requirements as a pleasant feel, ease of control, high resilience, and minimized scuffs by iron shots.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: June 24, 2003
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Yasushi Ichikawa, Shunichi Kashiwagi, Rinya Takesue, Nobuhiko Matsumura, Kunitoshi Ishihara
  • Solid golf balls and method of making
    Patent number: 6123628
    Abstract: A solid golf ball has a solid core and a cover formed of a resin composition comprising the reaction product of a thermoplastic polyurethane elastomer with an isocyanate compound. The ball is efficiently moldable and meets such requirements as a pleasant feel, ease of control, high resilience, and minimized scuffs by iron shots.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: September 26, 2000
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Yasushi Ichikawa, Shunichi Kashiwagi, Rinya Takesue, Nobuhiko Matsumura, Kunitoshi Ishihara
  • Wound golf ball
    Patent number: 6054550
    Abstract: A thread-wound golf ball includes a core having a center ball and a rubber thread layer and a cover. The cover of the ball has a two-layer structure consisting of an inner layer and an outer layer, each made from differing cover stock formulations of thermoplastic polyurethane elastomer.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: April 25, 2000
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Junji Umezawa, Shinichi Kakiuchi, Yasushi Ichikawa, Nobuhiko Matsumura, Kunitoshi Ishihara
  • Wound golf ball
    Patent number: 5993968
    Abstract: A thread-wound golf ball includes a core having a center ball and a rubber thread layer and a cover. The cover is composed primarily of a thermoplastic polyurethane elastomer of an aliphatic and/or alicyclic diisocyanate. The golf ball is prepared by impregnating the rubber thread layer with a urethane dispersion and injection molding the cover over the treated core.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: November 30, 1999
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Junji Umezawa, Shinichi Kakiuchi, Yutaka Masutani, Nobuhiko Matsumura, Kunitoshi Ishihara
  • Three-piece solid golf ball
    Patent number: 5899822
    Abstract: In a three-piece solid golf ball of the three layer structure consisting of a solid core, an intermediate layer, and a cover, the solid core has a distortion of at least 2.5 mm under a load of 100 kg. The Shore D hardness of the intermediate layer is at least 13 degrees higher than the Shore D hardness of the cover. The ball as a whole has an inertia moment of at least 83 g-cm.sup.2. The desirable properties of spin, feel, control and rolling are obtained.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: May 4, 1999
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Hisashi Yamagishi, Hiroshi Higuchi, Junji Hayashi, Nobuhiko Matsumura, Kunitoshi Ishihara
  • Three-piece solid golf ball
    Patent number: 5876294
    Abstract: In a three-piece solid golf ball of the three layer structure consisting of a solid core, an intermediate layer, and a cover, the specific gravity of the solid core is lower than the specific gravity of the intermediate layer and the cover, and the Shore D hardness of the intermediate layer is higher than the Shore D hardness of the cover. The ball as a whole has an inertia moment of at least 83 g-cm.sup.2. The desirable properties of spin, feel, control and distance are obtained.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: March 2, 1999
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Hisashi Yamagishi, Hiroshi Higuchi, Junji Hayashi, Nobuhiko Matsumura, Kunitoshi Ishihara
  • Golf ball
    Patent number: 5800286
    Abstract: A thread wound golf ball comprises a solid center and a wound core having a thread rubber layer formed by winding thread rubber around the center and a cover enclosing the wound core. The cover is based on a non-yellowing thermoplastic polyurethane elastomer, and the difference in specific gravity between the center and the cover is 0.2 or less.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: September 1, 1998
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Shinichi Kakiuchi, Yasushi Ichikawa, Takashi Maruko, Junji Umezawa, Kunitoshi Ishihara, Nobuhiko Matsumura
  • Golf ball
    Patent number: 5792008
    Abstract: A thread wound golf ball comprises a liquid center and a wound core having a thread rubber layer formed by winding thread rubber around the center and a cover enclosing the wound core. The cover is based on a non-yellowing thermoplastic polyurethane elastomer, and the difference in specific gravity between the center and the cover is 0.2 or less.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: August 11, 1998
    Assignee: Bridgestone Sports Co., Ltd.
    Inventors: Shinichi Kakiuchi, Yasushi Ichikawa, Takashi Maruko, Junji Umezawa, Kunitoshi Ishihara, Nobuhiko Matsumura
  • Thermoplastic polyurethane resin
    Patent number: 5274023
    Abstract: Disclosed is a thermoplastic polyurethane resin composition which contains a thermoplastic polyurethane resin (A) and a modified polyolefin resin (B) as its components. The polyurethane resin shows excellent flexibility, smooth touch, and stretching property when molded in the form of films or sheets. It is quite suitable for excretion-treating materials such as a diaper.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: December 28, 1993
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hoyo Takahashi, Takuji Hirose, Kunitoshi Ishihara
  • Thermoplastic polyurethane resin
    Patent number: 5109050
    Abstract: Disclosed is a thermoplastic polyurethane resin composition which contains a thermoplastic polyurethane resin (A) and a modified polyolefin resin (B) as its components. The polyurethane resin shows excellent flexibility, smooth touch, and stretching property when molded in the form of films or sheets. It is quite suitable for excretion-treating materials such as a diaper.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: April 28, 1992
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hoyo Takahashi, Takuji Hirose, Kunitoshi Ishihara