Patents by Inventor Michio Mituta

Michio Mituta 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 treating the mother liquor by pH adjusting in the production of anhydrous sodium dithionite
    Patent number: 4042675
    Abstract: In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises adding an alkali to the mother liquor left after the separation of the resulting anhydrous sodium dithionite to adjust its pH to at least 8, separating the solids precipitated, and oxidizing the filtrate with an oxidizing agent.
    Type: Grant
    Filed: May 18, 1975
    Date of Patent: August 16, 1977
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Kousuke Yamamoto, Shinji Takenaka, Kazuo Maeda, Michio Mituta