Patents by Inventor John F. McDowell

John F. McDowell 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 of controlling scale formation in aqueous systems
    Patent number: 5147555
    Abstract: A method of treating water to inhibit the formation of scale is disclosed. The method is particularly effective at inhibiting the formation and deposition of calcium and barium scales in aqueous systems such as cooling water systems. The method comprises introducing into the aqueous system a polyepoxysuccinic acid of the general formula ##STR1## when n ranges from about 2 to about 11, M is hydrogen or a water soluble cation such as Na.sup.+, NH.sub.4.sup.+, or K.sup.+ and R is hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl.
    Type: Grant
    Filed: July 30, 1991
    Date of Patent: September 15, 1992
    Assignee: Betz Laboratories, Inc.
    Inventors: J. Michael Brown, John F. McDowell, Kin-Tai Chang
  • Methods of controlling scale formation in aqueous systems
    Patent number: 5062962
    Abstract: A method of treating water to inhibit the formation of scale is disclosed. The method is particularly effective at inhibiting the formation and deposition of calcium and barium scales in circulating aqueous systems such as cooling water systems. The method comprises introducing into the aqueous system a polyepoxysuccinic acid of the general formula ##STR1## where n ranges from about 2 to about 11, M is hydrogen or a water soluble cation such as Na.sup.+, NH.sub.4.sup.+, or K.sup.+ and R is hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: November 5, 1991
    Assignee: Betz Laboratories, Inc.
    Inventors: J. Michael Brown, John F. McDowell, Kin-Tai Chang