Patents by Inventor Thomas K. Wilkinson

Thomas K. Wilkinson 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).

  • Process for the preparation of fluoroaliphatic aminocarboxylate surfactants
    Patent number: 5144069
    Abstract: A process for the synthesis of the fluorochemical compound having formulaR.sub.f SO.sub.2 N(CHR.sup.2 --CHR.sup.2 COO.sup.-) R.sup.1 N.sup.+ (R).sub.2 Hwherein R.sub.f is a fluoraliphatic radical containing at least 3 carbon atoms. The synthesis involves reaction of compounds of formula R.sub.f SO.sub.2 N(H)R.sup.1 N(R).sub.2 and CHR.sup.2 .dbd.CH.sup.2 COOH in solution at elevated temperatures. The process can be used to synthesize the fluoroaliphatic amphoteric amino carboxylate surfactant having the formula:C.sub.6 F.sub.13 SO.sub.2 N(C.sub.2 H.sub.4 COO.sup.-) C.sub.3 H.sub.6 N.sup.+ (CH.sub.3).sub.2 Hwhich compound is useful in aqueous film-forming foamable concentrates for extinguishing flammable liquid fires.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: September 1, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard M. Stern, Richard A. Guenthner, Roger R. Alm, Thomas K. Wilkinson