Patents by Inventor Larry P. Smith

Larry P. Smith 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).

  • Methods for the flocculation of coal fines and insoluble metals in coal mine waters
    Patent number: 5183575
    Abstract: Coal fines and suspended insoluble metals are flocculated from coal mine drainage waters by adding a polymeric tannin-amine compound.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: February 2, 1993
    Assignee: Betz Laboratories, Inc.
    Inventors: Stephen R. Vasconcellos, P. Douglas Boyce, Larry P. Smith