Patents by Inventor Uta Bottger

Uta Bottger 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 5-alkyl-2 (4-acyloxy-phenyl)-pyrimidine
    Patent number: 4311610
    Abstract: The invention relates to the application of nematic liquid-crystalline substances in electro-optical device elements for the display of numbers, symbols and images.Such nematic liquid crystals having low melting points and extremely high temperatures of transparency.The nematic liquid-crystalline substances are 5-alkyl-2-[4-acyloxyphenyl]-pyrimidines having the general formula ##STR1## wherein ##STR2## R.sup.1 =C.sub.n H.sub.2n+1, C.sub.n H.sub.2n+1 O, C.sub.n H.sub.2n+1 OCOO, C.sub.n H.sub.2n+1 COO, C.sub.n H.sub.2n+1 S, F, Cl, Br, NO.sub.2, CN CF.sub.3R.sup.2 =C.sub.n H.sub.2n+1n denotes any of the numbers between 1 and 10.These substituted pyrimidines are used in electro-optical device elements singly or as mixtures of each other, as well as mixtures with other liquid-crystalline or non liquid-crystalline components.
    Type: Grant
    Filed: August 20, 1980
    Date of Patent: January 19, 1982
    Assignee: VEB Werk fur Fernsehelektronik im VEB Kombinat Mikroelektronik
    Inventors: Horst Zaschke, Dietrich Demus, Adalbert Wiegeleben, Uta Bottger