Patents by Inventor Katsuharu Imi

Katsuharu Imi 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 producing methionine
    Patent number: 5945563
    Abstract: Methionine is produced in an improved yield while reducing the load of waste water disposal by a process including the steps of:(A) adding at least one compound selected from potassium carbonate, potassium bicarbonate and potassium hydroxide to a solution containing 5-(.beta.-methylmercaptoethyl)hydantoin, (B) saturating the resulting solution with carbon dioxide gas and separating deposited methionine while leaving a first filtrate behind,(C) transferring part or whole of the first filtrate to step (D),(D) heating the transferred filtrate, adding a water-miscible solvent to it and saturating it with carbon dioxide gas to deposit methionine and potassium bicarbonate, and separating these deposits while leaving a second filtrate behind, and(E) returning the second filtrate to step (A) if desired.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: August 31, 1999
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Katsuharu Imi, Tetsuya Shiozaki
  • Process for producing 1,4-dicyano-2-butene and catalyst therefor
    Patent number: 5637751
    Abstract: 2-Butene-1,4-diol and/or 3-butene-1,2-diol are (is) reacted with hydrogen cyanide in the presence of a molten catalyst comprising a cuprous halide and a non-aromatic organic amine hydrohalide.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: June 10, 1997
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Katsuharu Imi, Shigeo Wake