Patents by Inventor Elizabeth V. Bissinger

Elizabeth V. Bissinger 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).

  • Preparation of water soluble graft copolymers
    Patent number: 5789488
    Abstract: Disclosed are methods for reducing turbidity of aqueous systems and clarifying wastewater systems utilizing a graft copolymer having the structure: ##STR1## whereby the cationic monomer (F) is represented by ##STR2## wherein R is hydrogen or a C.sub.1 to C.sub.3 alkyl group, R.sub.1 is the salt of an ammonium cation, and the molar percentage of a:b is from about 95:5 to about 5:95, with the proviso that the sum of a and b equals 100%.
    Type: Grant
    Filed: June 25, 1996
    Date of Patent: August 4, 1998
    Assignee: BetzDearborn Inc.
    Inventors: Keith A. Bair, Elizabeth V. Bissinger, Ellen M. Meyer
  • Water treatment methods
    Patent number: 5575924
    Abstract: Disclosed are methods for reducing turbidity of aqueous systems and clarifying wastewater systems utilizing a graft copolymer having the structure: ##STR1## whereby the cationic monomer (F) is represented by ##STR2## wherein R is hydrogen or a C.sub.1 to C.sub.3 alkyl group, R.sub.1 is the salt of an ammonium cation, and the molar percentage of a:b is from about 95:5 to about 5:95, with the proviso that the sum of a and b equals 100%.
    Type: Grant
    Filed: May 4, 1995
    Date of Patent: November 19, 1996
    Assignee: BetzDearborn Inc.
    Inventors: Keith A. Bair, Elizabeth V. Bissinger, Ellen M. Meyer