Patents by Inventor Harold A. Chagnard, Jr.

Harold A. Chagnard, Jr. 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).

  • Treatment for water systems to inhibit corrosion and scale formation
    Patent number: 4869827
    Abstract: This invention relates to an improved composition and method which inhibit the corrosion of and the formation of scale on metals present in an aqueous system. The composition comprises a water soluble copolymer having moieties derived from acrylic acid and from lower alkyl hydroxy acrylates, and a combination of a manganese compound and an aminoalkylenephosphonic acid derivative or its salts.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: September 26, 1989
    Assignee: The Dow Chemical Company
    Inventors: Harold A. Chagnard, Jr., Mark K. Brayden, Thomas R. LeBlanc
  • Treatment for water systems to inhibit corrosion and scale formation
    Patent number: 4774018
    Abstract: This invention relates to an improved composition and method which inhibit the corrosion of and the formation of scale on metals present in an aqueous system. The composition comprises a water soluble copolymer having moieties derived from acrylic acid and from lower alkyl hydroxy acrylates, and a combination of a manganese compound and an aminoalkylenephosphonic acid derivative or its salts.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: September 27, 1988
    Assignee: The Dow Chemical Company
    Inventors: Harold A. Chagnard, Jr., Thomas R. LeBlanc, Mark K. Brayden