Patents by Inventor Peter K. L. G. Thevissen

Peter K. L. G. Thevissen 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).

  • Composition and method for controlling phosphonates tending to precipitate metal ions in water
    Patent number: 5627145
    Abstract: A method for controlling phosphonates which tend to precipitate with metal ions in water treatment operations comprising, adding to the water a water-soluble copolymer containing one or more of the following monomeric units: ##STR1## in which: R is hydrogen or an alkyl group, R.sub.1 is an alkyl group and X is hydrogen, NH.sub.4.sup.+, a water soluble metal ion or organic base; and[b] a monocarboxylic acid monomer; and adding the copolymer to the water to be treated in an amount sufficient to prevent precipitation of said phosphonates.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: May 6, 1997
    Assignee: BetzDearborn Inc.
    Inventor: Peter K. L. G. Thevissen
  • Composition and method for controlling phosphonates tending to precipitate metal ions in water
    Patent number: 5453416
    Abstract: A method for controlling phosphonates which tend to precipitate with metal ions in water treatment operations comprising, adding to the water a water-soluble copolymer containing one or more of the following monomeric units:[a] ##STR1## in which: R is hydrogen or an alkyl group, R.sub.1 is an alkyl group and X is hydrogen, NH.sub.4.sup.+, a water soluble metal ion or organic base; and[b] a monocarboxylic acid monomer; and adding the copolymer to the water to be treated in an amount sufficient to prevent precipitation of said phosphonates.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: September 26, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Peter K. L. G. Thevissen