Patents by Inventor Roy W. Schmidt

Roy W. Schmidt 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 the preparation of carboxylic acid
    Patent number: 4212994
    Abstract: A carboxylic acid is prepared by contacting an aqueous solution of the alkali metal or ammonium carboxylate with a liquid cation exchange agent dissolved in an organic solvent in which the carboxylic acid is substantially water immiscible. As an example, an aqueous solution of trisodium N-(2-hydroxyethyl)ethylenediaminetriacetate is contacted with di(2-ethylhexyl)phosphoric acid in kerosene to thereby form N-(2-hydroxyethyl)ethylenediaminetriacetic acid in the aqueous solution.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: July 15, 1980
    Assignee: The Dow Chemical Company
    Inventors: David A. Wilson, Roy W. Schmidt