Patents by Inventor Werner Ehret

Werner Ehret 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 vinyldiphosphonic acid and salts thereof
    Patent number: 4828766
    Abstract: An improved process for the preparation of vinyldiphosphonic acid is disclosed. The process involves elimination of a volatile acid from a 1-(O-acyl)-ethane-1,1-diphosphonic acid. The starting materials may be prepared by reacting 1-hydroxyethane-1,1-diphosphonic acid with the corresponding acid or directly by reacting the acid with phosphorous acid and an acyl anhydride.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: May 9, 1989
    Assignee: Benckiser-Knapsack GmbH
    Inventors: Stephan Kleemann, Werner Ehret