Patents by Inventor Toshiyuki Shigetome

Toshiyuki Shigetome 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).

  • METHOD FOR EXTRACTING ASYMMETRIC B-DIKETONE COMPOUND FROM B-DIKETONE COMPOUND
    Publication number: 20150291497
    Abstract: The present invention provides a method of extracting an asymmetric ?-diketone compound from a ?-diketone compound containing at least one symmetric ?-diketone compound mixed in the asymmetric ?-diketone compound, and the method includes the step (A) of adjusting a pH of a mixed solution of the ?-diketone compound and water at 11.5 or more and dissolving the ?-diketone compound into water to form a ?-diketone compound solution and the step (B) of subsequently adjusting the pH of the ?-diketone compound solution at 9.5 or less and recovering the asymmetric ?-diketone compound of Chemical Formula 1 separated from the ?-diketone compound solution. The present invention further includes at least either (a) a step of setting the upper limit of the pH of the mixed solution to 12.5 to form a ?-diketone compound solution in the step (A) and bringing the ?-diketone compound solution into contact with a hydrophobic solvent or (b) a step of setting the lower limit of the pH of the ?-diketone compound solution to 8.
    Type: Application
    Filed: October 17, 2013
    Publication date: October 15, 2015
    Inventors: Ryosuke Harada, Toshiyuki Shigetome, Satoshi Miyazaki, Masayuki Saito