Patents by Inventor Muneyasu Sameshima

Muneyasu Sameshima 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 preparing 1-aminoanthraquinone
    Patent number: 3975411
    Abstract: 5-Nitro-1,4,4a,9a-tetrahydroanthraquinone is suspended in water in the form of a powder and then catalytically hydrogenated in the presence both of a hydrogenation catalyst containing a metal such as palladium, platinum or the like as its effective component and of a base such as sodium hydroxide, pyridine or the like thereby to form a hydroquinone type compound of 1-aminoanthraquinone. By contacting the resultant reaction solution with air or by adding an oxidizing agent such as hydrogen peroxide to the reaction solution, the hydroquinone type compound is readily oxidized into 1-aminoanthraquinone in the suspended state.
    Type: Grant
    Filed: March 10, 1975
    Date of Patent: August 17, 1976
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Muneyasu Sameshima, Tagui Osawa, Utaka Hirai