Patents by Inventor Dobrinka Todorova Dotcheva

Dobrinka Todorova Dotcheva 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).

  • Tetraaroxyperylene-3,4,9,10-tetracarboxylic polyimides
    Patent number: 5677417
    Abstract: Polymeric tetraaroxyperylene-3,4,9,10-tetracarboxylic diimides of the formula I ##STR1## (R.sup.1 : denotes identical or different aryl radicals which may be substituted by cyano, nitro, halogen, C.sub.1 -C.sub.18 -alkoxy, C.sub.5 -C.sub.7 -cycloalkyl and/or C.sub.1 -C.sub.18 -alkyl and may each contain up to 24 carbon atoms;R.sup.2 : denotes C.sub.2 -C.sub.30 -alkylene groups whose carbon chain may be interrupted by from 1 to 10 oxygen atoms in ether function or by a phenylene or cyclohexylene group, or optionally C.sub.1 -C.sub.10 -alkylene- or oxygen-bridged C.sub.6 -C.sub.30 -arylene or cyclohexylene radicals;n: is from 2 to 100),preparation thereof and use thereof and also tetraaroxypery-lene-3,4,9,10-tetracarboxylic dianhydrides as intermediates therefor.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: October 14, 1997
    Assignee: Max-Planck-Gesellschaft zur Foerderung
    Inventors: Klaus Muellen, Dobrinka Todorova Dotcheva, Markus Klapper