Patents by Inventor Toshio Aoyama

Toshio Aoyama 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 of producing crystals of anhydrous sodium sulfide
    Patent number: 4908043
    Abstract: Disclosed are single crystals of anhydrous sodium sulfide, and a method of producing single crystals of anhydrous sodium sulfide, characterized in that the method comprises concentrating an aqueous solution of sodium sulfide at a temperature of 97.degree. C. or higher, the solution containing about 2 to about 15% by weight of NaOH based on the aqueous solution to precipitate single crystals of anhydrous sodium sulfide from the aqueous solution.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: March 13, 1990
    Assignee: Sankyo Kasei Co., Ltd.
    Inventors: Kannosuke Maeda, Toshio Aoyama