Patents by Inventor Yoshihisa Yatsuzuka

Yoshihisa Yatsuzuka 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).

  • Lubricant composition and its use in a ball joint
    Patent number: 6500787
    Abstract: A lubricant composition and a ball joint are disclosed. The lubricant composition has about 100 parts by weight of a viscous material chosen from polyisoprene rubber or a viscous composition of a polyisoprene rubber viscous substance, about 15-45 parts by weight of at least one compound chosen from a specific group of aliphatic amides or a specific group of aliphatic bisamides and about 5-30 parts by weight of at least one wax chosen from polyethylene wax, paraffin wax and microcrystalline wax. A ball joint is disclosed that contains this lubricant composition.
    Type: Grant
    Filed: August 9, 2001
    Date of Patent: December 31, 2002
    Assignee: Shell Oil Company
    Inventors: Keiji Tanaka, Yoshihisa Yatsuzuka, Ryuichi Masumori
  • Lubricant additive and lubricating grease composition containing the same
    Patent number: 5877129
    Abstract: A lubricant additive including a borate dispersion, wherein the lubricant additive is a dispersion of an alkali metal salt of boric acid in a mixture of an alkaline earth metal salt of a salicylic acid and an alkenylsuccinimide. The lubricant additive provides a high dropping point for grease used under a high temperature condition of 130.degree. C. or higher and per se exhibits anti-oxidant performance. A lubricant grease composition containing the lubricating additive is also disclosed.
    Type: Grant
    Filed: December 20, 1995
    Date of Patent: March 2, 1999
    Assignee: Showa Shell Sekiyu K.K.
    Inventors: Yoshihisa Yatsuzuka, Masaru Murata, Tetsuo Tsuchiya