Patents by Inventor Yutaka Kumagawa

Yutaka Kumagawa 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).

  • Pavement composite material with elastic surface layer and production method thereof
    Patent number: 6079900
    Abstract: A pavement composite material having elasticity and permeability can be obtained by accommodating a permeable concrete block after the solidification molding applied with an adhesive having a 50 to 100 centipoise viscosity on the surface to be bonded in a heat press mold, injecting a mixture of 50 to 90% by weight of rubber or plastic chips having a 1.0 to 10.0 mm particle size and 50 to 10% by weight of a thermosetting resin thereon, and a heat compression molding.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: June 27, 2000
    Assignee: Kabushiki Kaisha Discovery
    Inventors: Yutaka Kumagawa, Masakazu Io, Satoru Hara, Seiko Himeno
  • Air-permeable shoe
    Patent number: 4894932
    Abstract: An air-permeable shoe including a shoe constructed of an open-cell rubber foam. A base cloth is attached to the sole or insert therein. The sole of the shoe is exposed on a side surface of the sole of the shoe wherein a top side surface of the sole is in communication with the inside of the shoe and the ambient atmosphere. The open-cell rubber foam may be a rubber latex foam having a microstructure with a compression permanent set of less than 20%.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: January 23, 1990
    Assignee: Nippon Rubber Co., Ltd.
    Inventors: Masasuke Harada, Yutaka Kumagawa, Yoshiharu Moronaga