Patents by Inventor Werner Bieber

Werner Bieber 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).

  • Paper-coating slips containing fluorescent brighteners
    Patent number: 4888128
    Abstract: Fluorescent brightener salts of the formula ##STR1## in which A denotes the anion of an anionic cellulose fluorescent brightener,R.sub.1 denotes alkyl, alkenyl, aralkyl, aryl or cycloalkyl,R.sub.2, R.sub.3 and R.sub.4 denote hydrogen or R.sub.1, or together, including the N atom, form a heterocyclic ring, andn denotes 1 or 2,are suitable for incorporation into paper-coating slips. The brightened coating slips are distinguished, inter alia, by the fact that the achievable greying limit is very high.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: December 19, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jochen Koll, Friedhelm Muller, Werner Bieber, Joachim Konig, Udo Eckstein, Hans Theidel