Patents by Inventor Toshiyuki Akagawa

Toshiyuki Akagawa 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 disposal of waste containing heavy metal
    Patent number: 6638204
    Abstract: (A) Heavy metal-containing wastes are kneaded in melt with (B) an alkali metal compound or an alkaline earth metal compound and (C) sulfur, or with (E) a sulfide, or with these along with (D) a salt of a metal of which the standard electrode potential is higher than that of the cation of the component (B) or (E), in the presence of a non-aqueous medium, and the resulting melt mixture is cooled and solidified. In the method of treating heavy metal-containing wastes, the heavy metals in the wastes are efficiently passivated, and the heavy metals thus passivated are not released from the treated wastes.
    Type: Grant
    Filed: February 2, 2000
    Date of Patent: October 28, 2003
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Makoto Mizutani, Satoshi Hachiya, Toshiyuki Akagawa
  • METHOD OF DISPOSAL OF WASTE CONTAINING HEAVY METAL AND SEALING COMPOUND SUITEABLE FOR THE DISPOSAL
    Publication number: 20020123659
    Abstract: (A) Heavy metal-containing wastes are kneaded in melt with (B) an alkali metal compound or an alkaline earth metal compound and (C) sulfur, or with (E) a sulfide, or with these along with (D) a salt of a metal of which the standard electrode potential is higher than that of the cation of the component (B) or (E), in the presence of a non-aqueous medium, and the resulting melt mixture is cooled and solidified. In the method of treating heavy metal-containing wastes, the heavy metals in the wastes are efficiently passivated, and the heavy metals thus passivated are not released from the treated wastes.
    Type: Application
    Filed: February 2, 2000
    Publication date: September 5, 2002
    Inventors: MAKOTO MIZUTANI, SATOSHI HACHIYA, TOSHIYUKI AKAGAWA