Patents by Inventor Frederick Koeng

Frederick Koeng 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).

  • PHOTOGRAPHIC OR IMAGE RECIEVING ELEMENTS CONTAINING POLYMERIC MORDANTS
    Patent number: 3944424
    Abstract: A water-insoluble polymer comprising repeating units at least 1/3 of said repeating units having the formula: ##SPC1##Wherein R.sup.1 and R.sup.2 are hydrogen or alkyl and R.sup.3, R.sup.4 and R.sup.5 are alkyl groups wherein the total number of carbon atoms in R.sup.3, R.sup.4 and R.sup.5 is at least 12 and X.sup.-is an anion; is useful in dye mordant compositions in photographic elements. Preferred dye mordants comprise copolymers with styrene or methyl methacrylate.
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: March 16, 1976
    Assignee: Eastman Kodak Company
    Inventors: Hyman L. Cohen, Frederick Koeng, Ignazio Ponticello