Patents by Inventor Mikio Masunaga

Mikio Masunaga 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).

  • Heavy duty pneumatic radial tire having defined tire enlargement with inflation
    Patent number: 5025844
    Abstract: A heavy duty pneumatic radial tire including a pair of bead portions, a carcass consisting of one steel cord layer and extending between the bead portions, and a tread portion arranged radially outward of a crown portion of the carcass. A normal rim on which the tire is mounted has a bead seat at an angle of approximately 15.degree. relative to a rotating axis of the tire and engaging the bead portions of the tire. During filling the tire with inner pressure from 7% to 100% of a determined maximum inner pressure of the tire, a ratio A/B of an enlargement amount A of a shoulder in radial and outward directions to an enlargement amount B of the bead portion in axial and outward directions is within 0.25-0.7, preferably 0.3-0.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: June 25, 1991
    Assignee: Bridgestone Corporation
    Inventors: Hiroshi Ueda, Hisaaki Yoshigai, Mikio Masunaga
  • Heavy duty pneumatic tire having defined tire enlargement with inflation
    Patent number: 4962804
    Abstract: A heavy duty pneumatic radial tire including a pair of bead portions, a carcass consisting of one steel cord layer and extending between the bead portions, and a tread portion arranged radially outward of a crown portion of the carcass. A normal rim on which the tire is mounted has a bead base at an angle of approximately 5.degree. relative to a rotating axis of the tire and engaging the bead portions of the tire. During filling the tire with inner pressure from 7% to 100% of a determined maximum inner pressure of the tire, a ratio A/B of an enlargement amount A of a shoulder in radial and outward directions to an enlargement amount B of the bead portion in axial and outward directions is within 0.35-0.8, preferably 0.4-0.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: October 16, 1990
    Assignee: Bridgestone Corporation
    Inventors: Hiroshi Ueda, Hisaaki Yoshigai, Mikio Masunaga
  • Pneumatic tires
    Patent number: 4549593
    Abstract: A pneumatic tire is disclosed, which comprises a carcass composed of at least one ply and an inner liner arranged inside the carcass and composed of plural rubber layers. In the tire of this type, the inner liner comprises at least three layers of an outermost layer adjacent to the carcass, an innermost layer facing the inner space of the tire and an intermediate layer interposed between the innermost and outermost layers. The innermost layer is composed of a rubber composition containing 15-60 parts by weight of natural rubber and the balance of a halogenated butyl polymer as a rubber component, while the intermediate layer is composed of a rubber composition containing only a halogenated butyl polymer as a rubber component, which is different from that of the outermost layer in the rubber component.
    Type: Grant
    Filed: December 21, 1983
    Date of Patent: October 29, 1985
    Assignee: Bridgestone Tire Company Limited
    Inventors: Mitsuhisa Yahagi, Mikio Masunaga, Shuichi Watanabe, Tsutomu Tanaka