Patents by Inventor Hirohisa Kitagawa

Hirohisa Kitagawa 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).

  • Processes for producing alkyl ester of fatty acid
    Patent number: 6960672
    Abstract: The present invention relates to a process for preparing an alkyl ester of a fatty acid wherein a transesterification reaction is carried out between a fat or oil and an alcohol in the presence of a catalyst comprising a composite metal oxide having a perovskite structure; and a process for preparing an alkyl ester of a fatty acid wherein a transesterification reaction is carried out between a fat or oil and an alcohol in the presence of a catalyst comprising at least one member selected from the group consisting of oxides, hydroxides and carbonates of alkaline earth metals is used as the catalyst, with the alcohol made into a supercritical state or subcritical state. According to the present invention, the alkyl ester of a fatty acid which can be effectively utilized as a diesel fuel oil or the like can be prepared at high efficiency and on an industrial scale mainly from triglyceride contained in a fat or oil, especially a waste oil.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: November 1, 2005
    Assignee: Revo International Inc.
    Inventors: Masahide Nakayama, Keiichi Tsuto, Takenori Hirano, Tsutomu Sakai, Ayato Kawashima, Hirohisa Kitagawa
  • Processes for producing alkyl ester of fatty acid
    Publication number: 20040087809
    Abstract: The present invention relates to a process for preparing an alkyl ester of a fatty acid wherein a transesterification reaction is carried out between a fat or oil and an alcohol in the presence of a catalyst comprising a composite metal oxide having a perovskite structure; and a process for preparing an alkyl ester of a fatty acid wherein a transesterification reaction is carried out between a fat or oil and an alcohol in the presence of a catalyst comprising at least one member selected from the group consisting of oxides, hydroxides and carbonates of alkaline earth metals is used as the catalyst, with the alcohol made into a supercritical state or subcritical state. According to the present invention, the alkyl ester of a fatty acid which can be effectively utilized as a diesel fuel oil or the like can be prepared at high efficiency and on an industrial scale mainly from triglyceride contained in a fat or oil, especially a waste oil.
    Type: Application
    Filed: September 29, 2003
    Publication date: May 6, 2004
    Inventors: Masahide Nakayama, Keiichi Tsuto, Takenori Hirano, Tsutomu Sakai, Ayato Kawashima, Hirohisa Kitagawa
  • Anti-PAH monoclonal antibodies and cell lines producing the same
    Patent number: 6277964
    Abstract: The present invention provides monoclonal antibodies suitable for monitoring polycyclic aromatic hydrocarbons (PAHs) by an immunoasay, hybridoma cell lines producing said antibodies, and an immunoassay for analyzing PAHs in a sample using said monoclonal antibodies. In addition, the present invention provides PAH conjugates useful as an immunogen in preparing said antibodies and as a standard substance in a competitive assay.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: August 21, 2001
    Assignee: Osaka Gas Company Limited
    Inventors: Nobuhiko Yamashita, Kazunobu Miura, Naoya Ichimura, Chiwa Kataoka, Junko Sakaki, Yutaka Ohtani, Hirohisa Kitagawa
  • Processes for producing silicon- or germanium-containing organic compound, transition metal complex, catalyst for polymerization of &agr;-olefin and &agr;-olefin polymer
    Patent number: 6255515
    Abstract: An alkali metal- or alkali earth metal-containing organic compound (i) is reacted with a leaving group- and silicon- or germanium-containing compound (ii) in the presence of a nitrogen-containing aromatic heterocyclic compound. By such a method, it is possible to produce a silicon- or germanium-containing organic compound, for example, a cyclopentadienyl compound cross-linked by a silicon atom or a germanium atom, typically a cyclopentadienyl compound which is substituted with a substituted or unsubstituted silyl or germyl group, for a short time with a high yield.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: July 3, 2001
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Taku Kato, Kazuya Okano, Toshihiko Sugano, Yutaka Ohtani, Hirohisa Kitagawa, Sugio Nishimura