Patents by Inventor Witold Drzewinski

Witold Drzewinski 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 ethane derivatives, their preparation and the liquid crystal compositions containing same
    Patent number: 4849130
    Abstract: Liquid crystalline ethane derivatives by the described method in order to form liquid crystalline compositions with known liquid crystalline compounds have a general formula I: ##STR1## wherein, if ring A idicates a 1,4-substituted benzene ring, then ring B indicates 1.4-substituted benzene ring or 1.4-trans-substituted cyclohexane ring or 1.4-substituted bicyclo[2,2,2]octane ring or 2.5-substituted pyrimidine ring or 2.5-substituted 1.3- dioxane ring, or if ring B indicates a 1.4-substituted benzene ring, then A indicates 1.4-trans-substituted cyclohexane ring or 1.4-substituted bicylo[2,2,2]octane ring or 2.5-substituted pyrimidine ring or 2.5-substituted 1.3-dioxane ring, and R indicates a normal alkyl chain C.sub.n H.sub.2n+1 or a non-branched alkoxy group C.sub.n H.sub.2n+1 O or an alkylcarboxylic group C.sub.n H.sub.2n+1 COO or an alkyl carbonato group C.sub.n H.sub.2n+1 OCOO or a branched alkyl chain CH.sub.3 --CH.sub.2 --CH(CH.sub.3)--(CH.sub.2).sub.k -- or a branched alkoxy group CH.sub.3 --CH.sub.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: July 18, 1989
    Assignees: Wojskowa Akademia Techniczna, Zaklady Kineskopowe "Unitra-Polkolor" Zaklady Kineskopow Kolorowych
    Inventors: Roman Dabrowski, Jerzy Dziaduszek, Tomasz Szczucinnski, Witold Drzewinski, Zofia Stolarz, Jozef Zmija, Janusz Parka, Bozena Sosnowska