Patents by Inventor Philip R. Engelhardt

Philip R. Engelhardt 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).

  • Removal of iron fouling in cooling water systems
    Patent number: 4721532
    Abstract: Removing iron fouling from heat transfer surfaces of cooling water systems with an aqueous solution of certain alkylene amine carboxyl polyacids, or water soluble salts thereof, at a pH of 5-9.
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: January 26, 1988
    Assignee: W. R. Grace & Co.
    Inventors: Vincent R. Kuhn, Philip R. Engelhardt, Wayne A. Mitchell