Patents Examined by C. Harns
  • Patent number: 4997591
    Abstract: The chiral smetic liquid-crystalline compounds of the general formula (I)M.sub.1.sup.* --B--M.sub.2.sup.* (I)solidify on cooling from the liquid-crystalline phase in glassy form, as a result of which they are suitable for materials for displaying and storing information. Such materials may be used in electro-optic data stores or display components which are based on the ferroelectric or electroclinic switching effect in a chiral or chirally doped, smetic liquid-crystalline phase.In the general formula, M.sub.1.sup.*, M.sub.2.sup.* stand for chiral smetogenic groups and --B-- is, as bridging link, a typical bivalent group.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: March 5, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerd Heppke, Feodor Oestreicher