Patents by Inventor Yasuyo Fujita

Yasuyo Fujita 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).

  • Patent number: 6202724
    Abstract: A pneumatic tire comprising a silica-rich compound tread provided with an antistatic conductive rubber layer has improved safty based on durability and extrusion productivity. In this tire, the silica-rich compound rubber layer is divided at at least one portion in a width directional of the tire by a conductive rubber layer extended in a circumferential direction substantially over the whole thickness of said rubber layer. In this case, a thickness direction distance a in a width directional section of said rubber layer and an edge face length b of a divisional rubber layer consisting of said conductive rubber layer in a width directional section satisfy a relation formulated by the following expression, a<b.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: March 20, 2001
    Assignee: Bridgestone Corporation
    Inventors: Masato Hiruma, Akio Kusano, Yasuyo Fujita