Patents by Inventor Engelhard Wilhelm Pavonet

Engelhard Wilhelm Pavonet 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 purifying phosphoric acid
    Patent number: 3970741
    Abstract: A method for purifying phosphoric acid obtained with sulfuric acid acting on natural phosphates, comprises extracting the phosphoric acid with a mixed solvent formed essentially by 95% to 50% by volume of an ether containing 5 to 7 carbon atoms, and by 5% to 50% by volume of at least one of the esters resulting from the reaction of the phosphoric acid with alcohols having 3 to 5 carbon atoms.
    Type: Grant
    Filed: January 31, 1974
    Date of Patent: July 20, 1976
    Assignee: "Societe de Prayon"
    Inventor: Engelhard Wilhelm Pavonet