Patents by Inventor Kazuo Tan

Kazuo Tan 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 removing impurities from the mixture of cyclohexanone and cyclohexanol
    Patent number: 5168983
    Abstract: A process for separating cyclohexanol and other impurities from a mixture containing cyclohexanone and cyclohexanol is disclosed.
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: December 8, 1992
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Kazuo Tan, Kazuhiro Fujii, Michio Nakamura, Kazunao Hanada
  • Method for producing high-purity caprolactam
    Patent number: 4900821
    Abstract: A method for producing high-purity caprolactam from a mixture comprising a melt of crude caprolactam and water, which comprises cooling the mixture in a crystallizer under a reduced pressure of from 1 to 22 Torr while maintaining the water concentration in the mixture at a level of from 0.5 to 10% by weight, to crystallize high-purity caprolactam, and then separating the resulting crystals.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: February 13, 1990
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Kazuo Tan, Takashi Hironaka, Michio Nakamura