Patents by Inventor Kerstin Zab

Kerstin Zab 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).

  • Liquid-crystalline allenes
    Patent number: 5695681
    Abstract: Liquid-crystalline allenes of the formula I ##STR1## where M is a mesogenic group,R.sup.1 and R.sup.2 are hydrogen or a C-organic radical having 1-8 carbon atoms,R.sup.3 is a C-organic radical having 1-30 carbon atoms,X.sup.1 is --(CH.sub.2).sub.q --O--(CH.sub.2).sub.p --,--(CH.sub.2).sub.q --NR.sup.4 --(CH.sub.2).sub.p --,--(CH.sub.2).sub.q --CO--O--(CH.sub.2).sub.p --,--(CH.sub.2).sub.q --O--CO--(CH.sub.2).sub.p --,--(CH.sub.2).sub.q --CO--NR.sup.4 --(CH.sub.2).sub.p -- or--(CH.sub.2).sub.q --NR.sup.4 --CO--(CH.sub.2).sub.p --,R.sup.4 is hydrogen or an alkyl radical having 1-4 carbon atoms,p is from 1 to 20, andq is from 0 to 20,where the definitions of R.sup.2 and R.sup.3 can also be interchanged, are used in optical display elements.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: December 9, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl Siemensmeyer, Carsten Tschierske, Kerstin Zab