Patents by Inventor William D. Spears

William D. Spears 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).

  • Corrosion inhibition of metals in water systems using aminophosphonic acid derivatives in combination with manganese
    Patent number: 4640818
    Abstract: The invention is an improved process for inhibiting corrosion of metals in water conducting systems. It comprises employing in combination a compound of manganese together with organic aminoalkylenephosphonic acid derivatives to the water in such systems. These amine derivative compounds may also contain other functional groups, e.g., carboxylates, quaternary amines, hydroxyalkyl groups and the like.
    Type: Grant
    Filed: June 13, 1985
    Date of Patent: February 3, 1987
    Assignee: The Dow Chemical Company
    Inventors: Jeffrey G. Grierson, Carol A. Jones, William D. Spears