Patents by Inventor Olaf Agert

Olaf Agert 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).

  • Defined oligomeric liquid-crystalline compounds having smectic liquid-crystalline phases
    Patent number: 5417884
    Abstract: Liquid-crystalline compounds of the formulae I and II;Z.sup.1 -(X.sup.1 -R.sup.1 -y-M).sub.m IZ.sup.2 -(X.sup.2 -R.sup.1 -Y-M).sub.n IIwhere Z.sup.1 is the radical of an m-valent alcohol an m-valent acid or certain trivalent triazine derivatives; Z.sup.2 is an n-valent radical of a monocyclic or polycyclic aromatic compound; X.sup.1 is a chemical bond or -CO-; X.sup.2 is -O-, -S-, -CO-O-, -O-CO-, -SO.sub.2 -, -SO.sub.2 -O-, -O-SO.sub.2 -O-, -NR.sup.4- , -CO-NR.sup.4 -, -NR.sup.4 -O- or -CO-N<, where R.sup.4 is H or C.sub.1 -C.sub.8 -alkyl; m and n are 3 to 6; R.sup.1 is a C.sub.2 2-C.sub.20 -bridge having 2 to 12 bridging members, which may be interrupted by -O-, -S- or -NR.sup.4 -, each of these hetero units being separated by at least 2 carbon atoms; Y is a chemical bond, -O-, -S-, -CO-O-, -O-CO-, -NR.sup.4 -, -CO-NR.sup.4 - or -NR.sup.4 -CO.sup. -; M is a mesogenic group. These compounds are suitable for the production of optical and electro-optical data carriers and display elements.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: May 23, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Etzbach, Karl Siemensmeyer, Detlev Joachimi, Carsten Tschierske, Olaf Agert