Patents by Inventor Zygfryd Witkiewicz

Zygfryd Witkiewicz 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 isothiocyanates with dioxane ring and liquid crystalline admixtures containing same
    Patent number: 4676924
    Abstract: New compounds of the general formula: ##STR1## wherein the symbols X stand for carbon atom bonded with two hydrogen atoms /--CH.sub.2 -- group/ and the symbols Z stand for oxygen atom or the symbols X stand for oxygen atom and the symbols Z stand for carbon atom bonded with two hydrogen atoms /--CH.sub.2 -- group/, m is an integer of 1 to 2, R represents an alkyl /H.sub.2n+1 C.sub.n / or an 4-alkylphenyl /H.sub.2n+1 C.sub.n --C.sub.6 H.sub.4 / or an alkylbiphenyl /H.sub.2n+1 C.sub.n --C.sub.6 H.sub.4 --C.sub.6 H.sub.4 / or an alkylcyclohexylphenyl group /H.sub.2n+1 C.sub.n --C.sub.6 H.sub.10 --C.sub.6 H.sub.4 /, the term alkyl group signifies an alkyl chain containing 1 to 15 carbon atoms or it also signifies a branched-chain alkyl group C.sub.2 H.sub.5 --CH/CH.sub.3 /--/CH.sub.2 /.sub.k where k in an integer of 1 to 3, have utility as liquid crystals. A process for manufacture of compounds of the general formula I.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: June 30, 1987
    Assignee: Wojskowa Akademia Techniczna
    Inventors: Roman Dabrowski, Jerzy Dziaduszek, Jaroslaw Szulc, Zygfryd Witkiewicz, Zofia Stolarz, Krystyna Kenig, Gabriela Adamska