Patents by Inventor Christoph Naumann

Christoph Naumann 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).

  • Bipyridyls and their use as inks
    Patent number: 5266700
    Abstract: Process employing bipyridyls as inks, of the general formula ##STR1## in which R, R' are, for example, alkyl and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 are, for example hydrogen or alkyl radicals, or R.sup.1 and R.sup.2 or R.sup.2 and R.sup.3, and/or R.sup.4 and R.sup.5 or R.sup.5 and R.sup.6 together with the pyridine ring form in isoquinoline or quinoline ring system.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: November 30, 1993
    Assignee: Riedel-De-Haen
    Inventors: Heinz Langhals, Christoph Naumann