The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 1991
Filed:
Jun. 28, 1989
Applicant:
Inventors:
Gunter Scherowsky, Berlin, DE;
Peter Schreiber, Berlin, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548544 ; 548547 ;
Abstract
Chiral substituted tartarimides, a process for their preparation and their use as doping agents in liquid-crystal mixtures. The new chiral N-substituted tartarimides which are esterified on both of the OH groups (pyrrolidinediones) are characterized by the general formula (I) ##STR1## in which the symbols have the following meaning: R.sup.2 denotes linear or branched (C.sub.1 -C.sub.16)-alkyl, it being possible for one or two non-adjacent CH.sub.2 groups to be replaced by O or S, or, if n1=1, also denotes F, Cl, Br or CN,