Patents by Inventor Yuzo Fujiwara

Yuzo Fujiwara 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).

  • Process for direct conversion of methane into acetic acid
    Patent number: 7238838
    Abstract: The invention consists on the utilization of complexes of vanadium (in the +4 and +5 oxidation states) with bi- or poly-dentate ligands coordinated by nitrogen and oxygen (N,O) or by oxygen and oxygen (O,O) atoms, namely derivatives of aminoalcohols, (hydroxyimino)dicarboxylic acids, hydroxypyranones, trifluoroacetic acid, triflic acid or inorganic acid, as catalysts for the direct single-pot conversion, under mild conditions, of methane in acetic acid, either in the absence or in the presence of carbon monoxide, and in the presence of a peroxodisulfate salt (K2S2O8), in trifluoroacetic acid (CF3COOH), according to the general reaction (I).
    Type: Grant
    Filed: October 15, 2003
    Date of Patent: July 3, 2007
    Assignee: Instituto Superior Tecnico
    Inventors: Armando Pombeiro, Joäo Fraústo Da Silva, Yuzo Fujiwara, Josë Silva, Patricia Reis, António F. Palavra
  • Vanadium catalysts and process for the direct conversion of methane into acetic acid
    Publication number: 20060155145
    Abstract: The invention consists on the utilization of complexes of vanadium (in the +4 and +5 oxidation states) with bi- or poly-dentate ligands coordinated by nitrogen and oxygen (N,O) or by oxygen and oxygen (O,O) atoms, namely derivaties of aminoalcohols, (hydroxyimino)dicarboxylic acids, hydroxypyranones, trifluoroacetic acid, triflic acid or inorganic acid, as catalysts for the direct single-pot conversion, under mild conditions, of methane in acetic acid, either in the absence or in the presence of carbon monoxide, and in the presence of a peroxodisulfate salt (K2S2O8), in trifluoroacetic acid (CF3COOH), according to the general reaction (I).
    Type: Application
    Filed: October 15, 2003
    Publication date: July 13, 2006
    Inventors: Armando Pombeiro, Joao Frausto Da Silva, Yuzo Fujiwara, Jose Silva, Patricia Reis, Antonio Palavra
  • Process for producing aromatic carbonate
    Patent number: 6596896
    Abstract: A process for producing an aromatic carbonate by reacting an aromatic monohydroxy compound with carbon monoxide and molecular oxygen, wherein the reaction is carried out in the presence of: (a) palladium or a palladium compound (component (a)); (b) a redox catalyst (component (b)); (c) a heteropoly-acid or salt thereof (component (c)); and (d) a quaternary ammonium salt or quaternary phosphonium salt (component (d)), and under dehydration conditions. According to the present invention, an aromatic carbonate can be produced from an aromatic monohydroxy compound by a simple process economically and efficiently.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: July 22, 2003
    Assignee: Teijin Limited
    Inventors: Eishin Yoshisato, Tetsuo Ban, Masaharu Muramoto, Yuzo Fujiwara, Teizo Yamaji, Chengguo Jia, Guochuan Yin
  • Process for producing aromatic carbonate
    Publication number: 20030032831
    Abstract: A process for producing an aromatic carbonate by reacting an aromatic monohydroxy compound with carbon monoxide and molecular oxygen, wherein
    Type: Application
    Filed: September 3, 2002
    Publication date: February 13, 2003
    Inventors: Eishin Yoshisato, Tetsuo Ban, Masaharu Muramoto, Yuzo Fujiwara, Teizo Yamaji, Chengguo Jia, Guochuan Yin
  • Process for producing carboxylic acids
    Patent number: 5281752
    Abstract: Lower carboxylic acids such as acetic acid, are produced efficiently from inexpensive lower alkanes such as methane by allowing the lower alkanes to react with carbon monoxide in the presence of palladium and/or copper catalysts and salts of peroxy acids.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: January 25, 1994
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yuzo Fujiwara, Ken Takaki