Patents by Inventor Hirotaka Ryuto

Hirotaka Ryuto 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 the production of aromatic carbamates
    Patent number: 4469882
    Abstract: A process for producing aromatic carbamates in high yield is described, which comprises reacting aromatic nitro compounds, organic compounds containing a hydroxy group, and carbon monoxide in the presence of a catalyst comprising: (1) a platinum group metal or its compound, (2) metallic vanadium or its compound, (3) metallic iron or its compound, (4) a halogen atom, and (5) a tertiary amine, wherein the amount of each component used and the composition are adjusted within specific ranges.
    Type: Grant
    Filed: June 23, 1982
    Date of Patent: September 4, 1984
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Tsutomu Takeuchi, Mineo Nishi, Toshio Irie, Hirotaka Ryuto