Patents by Inventor Stephen M. Gardocki

Stephen M. Gardocki 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 heavy metals from waste streams
    Patent number: 4758353
    Abstract: Heavy metals are removed from effluent waters using the sequential steps comprising:A. Adding a surfactant;B. pH adjustment;C. Adding a cationic coagulant;D. Adding a flocculant; and,E. Recovering the floc formed by the flocculant.
    Type: Grant
    Filed: June 19, 1987
    Date of Patent: July 19, 1988
    Assignee: Nalco Chemical Company
    Inventors: Michael D. Spence, John M. Kozaruk, Mark Melvin, Stephen M. Gardocki