Patents by Inventor S. Tonya Stefko

S. Tonya Stefko 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).

  • Aminoplast curable film-forming compositions providing films having resistance to acid etching
    Patent number: 6228974
    Abstract: An aminoplast-curable film-forming composition is disclosed. The film-forming composition is a crosslinkable composition comprising (1) a material containing a plurality of carbamate and/or urea functional groups and (2) an aminoplast crosslinking agent. The composition provides a coating with improved acid etch resistance, making the coating particularly useful as an automotive clear coat.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: May 8, 2001
    Assignee: PPG Industries Ohio, Inc.
    Inventors: Gregory J. McCollum, Debra L. Singer, Kurt G. Olson, S. Tonya Stefko, Michael A. Mayo, Dennis L. Faler
  • Aqueous aminoplast curable film-forming compositions providing films having resistance to acid etching
    Patent number: 6103816
    Abstract: An aqueous aminoplast-curable film-forming composition is disclosed. The aqueous film-forming composition is a crosslinkable composition comprising (1) a material containing a plurality of carbamate and/or urea functional groups and (2) an aminoplast crosslinking agent. The aqueous composition provides a coating with improved acid etch resistance, making the compositions particularly useful as automotive clear coats.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: August 15, 2000
    Assignee: PPG Industries Ohio, Inc.
    Inventors: Shanti Swarup, Debra L. Singer, Gregory J. McCollum, Kurt G. Olson, S. Tonya Stefko, Richard J. Sadvary, Robyn E. McMillan, Michael A. Mayo