Patents by Inventor Hiroaki Ishitsuka

Hiroaki Ishitsuka 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 high-purity erythritol crystal
    Patent number: 6030820
    Abstract: A process for producing a high-purity erythritol crystal comprising a crystallization step of subjecting an erythritol-containing aqueous solution as a raw solution to crystallization, wherein an erythritol concentration of said erythritol-containing aqueous solution is adjusted to 30 to 60% by weight at the beginning of the crystallization step; said erythritol-containing aqueous solution is cooled at a cooling rate of not more than 20.degree. C./hour; a seed crystal of erythritol is added to said erythritol-containing aqueous solution in the course of the cooling, and the solution is cooled to not more than 20.degree. C. Such a process for producing a high-purity erythritol crystal of the present invention has a still higher purity and is further improved in crystal shape as compared to those produced by conventional processes.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: February 29, 2000
    Assignees: Mitsubishi Chemical Corporation, Nikken Chemicals Co., Ltd.
    Inventors: Satoshi Morioka, Takahiro Abe, Toshihiro Maeda, Arihiro Taki, Katsuhiko Sawada, Hiroaki Ishitsuka