Patents by Inventor Douglas Clarkson

Douglas Clarkson 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).

  • Microbiological control agent
    Patent number: 5023267
    Abstract: A method of treating an aqueous or non-aqueous system, including paints and adhesives, is described which comprises adding to the system a thiolan of the formula: ##STR1## wherein each of X and Y, which may be the same or different, represents fluorine, chlorine or bromine, in combination with an alkylene bisthiocyanate and a 2-N-alkyl-4-isothiazolin-3-one.
    Type: Grant
    Filed: May 17, 1989
    Date of Patent: June 11, 1991
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Douglas Clarkson, Richard P. Clifford, Alan Marshall
  • Microbiological control process
    Patent number: 4863616
    Abstract: A method of treating an aqueous or non-aqueous system, including paints and adhesives, is described which comprises adding to the system a thiolan of the formula: ##STR1## wherein each of X and Y, which may be the same or different, represents fluorine, chlorine or bromine, in combination with an alkylene bisthiocyanate and a 2-N-alkyl-4-isothiazolin-3-one.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: September 5, 1989
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Douglas Clarkson, Richard P. Clifford, Alan Marshall
  • Biocide
    Patent number: 4853411
    Abstract: A method of treating an aqueous or non-aqueous dfsystem is disclosed which comprises adding to the system a thiolan of the formula ##STR1## wherein each of X and Y, which may be the same or different, represents fluorine, chlorine or bromine, in combination with a sulphone of the formula: ##STR2## in which R.sub.1 represents an optionally halogenated alkyl radical or an optionally substituted aryl radical, R.sub.2 represents a cyano or amidocarbonyl radical and X represents a halogen atom.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: August 1, 1989
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Douglas Clarkson, Richard P. Clifford