Patents by Inventor Carol S. Greer

Carol S. Greer 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).

  • Enhanced removal of hydrophobic contaminants from water clarification systems
    Patent number: 5798046
    Abstract: The present invention provides a method for removing secondary fiber contaminants from paper mill process waters comprising adding a polyvinyl chloride, a cationic polymeric coagulant and a polymeric flocculant to paper mill process waters containing secondary fiber contaminants in an amount sufficient to agglomerate the secondary fiber contaminants to larger particles sizes, and removing the secondary fiber contaminants from the process water by a dissolved air flotation clarification technique. The addition of particulate polyvinyl chloride in combination with a polymeric coagulant and flocculant prior to the DAF clarification process causes the contaminants to become preferentially coated with the polyvinyl chloride particles. This coating is what causes the subsequent removal of the secondary fiber contaminants in the DAF clarification process to be more effective.
    Type: Grant
    Filed: August 20, 1996
    Date of Patent: August 25, 1998
    Assignee: Nalco Chemical Company
    Inventors: Carol S. Greer, Ann M. Capozzi, Linda S. Wilkins
  • Method for reducing pitch deposition using copolymer of N-vinyl acetamide
    Patent number: 5597448
    Abstract: Pitch in paper mills is controlled by treating paper mill systems with a water soluble polymer which contains a lower alkyl N-vinyl amide or a hydrolyzed lower alkyl N-vinyl amide.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: January 28, 1997
    Assignee: Nalco Chemical Company
    Inventors: Peter E. Reed, Carol S. Greer
  • Polydiallyl dimethyl ammonium chloride/3-acrylamido-3-methylbutanoic acid copolymers and their use for pitch control in paper mill systems
    Patent number: 5393380
    Abstract: Diallyl dimethyl ammonium chloride/3-acrylamido-3-methyl-butanoic acid copolymers were prepared and found to be effective pitch control agents in papermaking systems.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: February 28, 1995
    Assignee: Nalco Chemical Company
    Inventors: Peter E. Reed, Carol S. Greer
  • Hydrophobic polyelectrolyte coagulants for the control of pitch in pulp and paper systems
    Patent number: 5246547
    Abstract: A method for controlling pitch in papermaking systems which comprises the step of adding a hydrophobic polyelectrolyte copolymer coagulant to pulp and paper process water. The hydrophobic polyelectrolyte copolymer coagulant comprises diallyldimethylammonium chloride and a hydrophobic monomer selected from the group consisting of: quaternized dimethylaminoethylacrylates and quaternized dimethylaminoethylmethacrylates.
    Type: Grant
    Filed: July 14, 1992
    Date of Patent: September 21, 1993
    Assignee: Nalco Chemical Company
    Inventors: Martha R. Finck, Carol S. Greer, Manian Ramesh
  • Synergistic pitch control process utilizing ammonium zirconium and cationic polymers
    Patent number: 5230774
    Abstract: Pitch control agents comprising a combination of water-soluble zirconium compounds and cationic polymers are described.Ammonium zirconium carbonate is preferred in combination with poly DADMAC and/or with EPI-DMA polymers.
    Type: Grant
    Filed: September 3, 1991
    Date of Patent: July 27, 1993
    Assignee: Nalco Chemical Company
    Inventors: Carol S. Greer, Nancy P. James