Patents by Inventor Lothar Kaufmann

Lothar Kaufmann 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 for preparation of alkali metal selenates
    Patent number: 4536383
    Abstract: A method for the preparation of alkali metal selenates through oxidation of powdered selenium with hydrogen peroxide and neutralization of the formed selenic acid with alkali metal hydroxide or alkali metal carbonate, wherein the selenium oxide in the first step is brought to reaction at the surface of a warmed portion of hydrogen peroxide and subsequently in a second step the resulting acid solution is partially neutralized and the remaining selenite is further converted with hydrogen peroxide to the selenate.
    Type: Grant
    Filed: October 3, 1984
    Date of Patent: August 20, 1985
    Assignee: Degussa Aktiengesellschaft
    Inventors: Lothar Kaufmann, Klaus-Dieter Hellwig