Patents by Inventor Bernd Derber

Bernd Derber 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).

  • Aniline-based oil-soluble azo dyes
    Patent number: 5182372
    Abstract: Azo dyes of the formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 independently denote hydrogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy,R.sup.4 denotes C.sub.1 -C.sub.6 -alkyl andR.sup.5 denotes C.sub.2 -C.sub.8 -alkyl which is substituted by hydroxy and may be interrupted by 1, 2 or 3 oxygen atoms,provided that the total number of carbon atoms in the radicals R.sup.4 and R.sup.5 is at least 5,mineral oils containing one or more of said novel dyes and the use of said dyes for marking mineral oils.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: January 26, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernd Derber, Guenter Hansen, Helmut Reichelt, Christos Vamvakaris, Georg Zeidler
  • Dye mixtures containing an oil-soluble dye and an acid-extractable dye
    Patent number: 4904765
    Abstract: Dye mixtures contain an oil-soluble dye and a dye of the formula ##STR1## where D is phenyl which is unsubstituted or substituted by methyl or methoxy, R is hydrogen or methyl, R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl and R.sup.2 is C.sub.3 - or C.sub.4 -alkyl.The mixtures according to the invention are preferably used for coloring and marking mineral oil products.
    Type: Grant
    Filed: July 14, 1987
    Date of Patent: February 27, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernd Derber, Rudolf Denninger