Patents by Inventor Roger Frach

Roger Frach 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 substances
    Patent number: 4626375
    Abstract: New liquid-crystalline esters of the 4-[(4-alkyl-cyclohexyl)-methyl]-benzoic acids or cyclohexanecarboxylic acids which are suitable for electro-optical displays have the general formula ##STR1## wherein R.sup.1 =C.sub.n H.sub.2n+1R.sup.2 =H, ##STR2## wherein n=an integer from 1 to 10,m=an integer from 1 to 10,S=an integer from 1 to 10.
    Type: Grant
    Filed: October 10, 1984
    Date of Patent: December 2, 1986
    Assignee: VEB Werk fuer Fernsehelektronik
    Inventors: Dietrich Demus, Roger Frach, Hans-Joachim Deutscher, Horst Zaschke