Patents by Inventor Kazuma Morotomi

Kazuma Morotomi 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).

  • Steel cords for elastomer articles and pneumatic radial tires using the same
    Patent number: 5457949
    Abstract: A steel cord of 1+3 structure is formed by twisting three sheath steel filaments around a single core steel filament. In this case, the three sheath steel filaments are arranged so as to satisfy conditions at a section of the sheath perpendicular to a longitudinal direction of the cord that a maximum angle of a triangle formed by connecting central points of the these filaments to each other is not less than 90.degree. but less than 180.degree. and an apex defining the maximum angle is always located on the same filament and a distance between the central point of this filament and the central point of the filament adjacent thereto is 1.0-1.3 times of the diameter of the filament.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: October 17, 1995
    Assignee: Bridgestone Corporation
    Inventors: Motonori Bundo, Kazuma Morotomi
  • Metal cords for rubber reinforcement and tires using the same
    Patent number: 5429878
    Abstract: A metal cord usable for the reinforcement of rubber articles is comprised of a helically formed single wire filament having a twisting angle of 75-84.5.degree. or a bundle of two twisted metal filaments each having a twisting angle of 75-84.5.degree.. Such metal cords are preferably used as a rubber reinforcement in each part of a pneumatic tire.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: July 4, 1995
    Assignee: Bridgestone Corporation
    Inventors: Motonori Bundo, Kazuma Morotomi
  • Metal cords for rubber reinforcement and tires using the same
    Patent number: 5295346
    Abstract: A metal cord usable for the reinforcement of rubber articles is comprised of a helically formed single wire filament having a twisting angle of 75-84.5.degree. or a bundle of two twisted metal filaments each having a twisting angle of 75-84.5.degree.. Such metal cords are preferably used as a rubber reinforcement in each part of a pneumatic tire.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: March 22, 1994
    Assignee: Bridgestone Corporation
    Inventors: Motonori Bundo, Kazuma Morotomi