Patents by Inventor Takeaki Fujii

Takeaki Fujii 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 and combination lubricant and refrigerant composition
    Patent number: 5798054
    Abstract: A lubricant and combination lubricant and refrigerant composition for use in a refrigerating machine in which a substitute freon refrigerant, which lubricant contains a polymer of a fumaric ester or a fumaric ester and a copolymerizable alkylene, and optionally contains an organic carboxylic ester or a polyalkylene glycol with a kinematic viscosity of 2 to 30 cSt. The lubricant is compatible with substitute freon refrigerants such as hydrogen-containing halogenated hydrocarbons, particularly R 134a, in a wide temperature range, has a high viscosity index, is thermally and chemically stable, and has an excellent lubricity.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: August 25, 1998
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Takehisa Sato, Hironari Ueda, Toshiaki Kuribayashi, Satoshi Asano, Tadashi Niwa, Hiroshi Ueno, Takeaki Fujii, Sadakatsu Suzuki
  • Aliphatic polyester and a process for the preparation thereof
    Patent number: 5741882
    Abstract: A process to prepare a high molecular weight aliphatic polyester is disclosed, where a catalyst is portionwise added, and a radical scavenger is also added. The aliphatic polyester obtained has a number average molecular weight larger than 70,000.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: April 21, 1998
    Assignee: Tonen Corporation
    Inventors: Takeaki Fujii, Kenji Kobayashi, Sadakatsu Suzuki, Hiroshi Ueno