Patents by Inventor Virginia C. Markevka

Virginia C. Markevka 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).

  • Substituted pentafluoroantmonic acid-substituted aniline epoxy curing catalysts
    Patent number: 5280067
    Abstract: A two-part, thermally curable epoxy composition comprising an epoxy resin; a curing agent prepared from a substituted pentafluoroantimonic acid and a substituted benzene having an amino substituent and an electron-withdrawing substituent on the benzene ring; a polyol; and a toughening agent. The compositions exhibit desirable green strength and pot life.
    Type: Grant
    Filed: August 18, 1992
    Date of Patent: January 18, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kent S. Tarbutton, Janis Robins, Virginia C. Markevka
  • Bonding method employing thermally stable hot melt moisture-cure polyurethane adhesive composition
    Patent number: 4891269
    Abstract: A one-package thermally stable hot melt pressure-sensitive moisture-cure polyurethane composition that can be extruded at elevated temperatures to form a hot melt glue line with very high green strength that can moisture-cure to a strong urethane adhesive bond.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: January 2, 1990
    Assignee: H. B. Fuller Company
    Inventors: Virginia C. Markevka, Sandra J. Mackey, William L. Bunnelle
  • Thermally stable reactive hot melt urethane adhesive composition having a thermoplastic polymer, a compatible, curing urethane polyalkylene polyol prepolymer and a tackifying agent
    Patent number: 4820368
    Abstract: Hot melt adhesive compositions combining the characteristics of hot melt adhesives and reactive adhesives can be prepared by blending a thermoplastic polymer, having sufficient structural integrity to provide cohesive strength, with a urethane prepolymer and a tackifying agent. The composition has sufficient green strength to form initial bonds. Additionally, over time, the composition cures to a final rigid, resilient structural adhesive bond.
    Type: Grant
    Filed: May 7, 1987
    Date of Patent: April 11, 1989
    Assignee: H. B. Fuller Company
    Inventors: Virginia C. Markevka, John M. Zimmel, Elizabeth R. Messman, William L. Bunnelle
  • Thermally stable reactive hot melt urethane adhesive composition having a thermoplastic polymer, a compatible, curing urethane polyester polyol prepolymer and a tackifying agent
    Patent number: 4808255
    Abstract: Reactive hot melt adhesive compositions combining the characteristics of hot melt adhesives and curing urethane adhesive can be prepared by blending an ethylene-vinyl monomer thermoplastic polymer having sufficient structural integrity to provide cohesive strength with a urethane prepolymer and a tackifying agent. The composition has sufficient green strength to form initial bonds. Additionally, over time, the composition cures to a final rigid, resilient quality structural adhesive bond.
    Type: Grant
    Filed: May 7, 1987
    Date of Patent: February 28, 1989
    Assignee: H. B. Fuller Company
    Inventors: Virginia C. Markevka, John M. Zimmel, Elizabeth R. Messman, William L. Bunnelle, Jeffrey M. Swoboda
  • Thermally stable hot melt moisture-cure polyurethane adhesive composition
    Patent number: 4775719
    Abstract: A one-package thermally stable hot melt pressure-sensitive moisture-cure polyurethane composition that can be extruded at elevated temperatures to form a hot melt glue line with very high green strength that can moisture-cure to a strong urethane adhesive bond.
    Type: Grant
    Filed: January 29, 1986
    Date of Patent: October 4, 1988
    Assignee: H. B. Fuller Company
    Inventors: Virginia C. Markevka, Sandra J. Mackey, William L. Bunnelle