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:
Jan. 10, 1995
Filed:
Oct. 20, 1993
Stephen Kelly, Mohlin, CH;
Martin Schadt, Seltisberg, CH;
Hoffmann-La Roche Inc., Nutley, NJ (US);
Abstract
Compounds having the Formula: ##STR1## wherein R.sup.1 denotes an alkenyl group; A.sup.1 and A.sup.2 each independently represent 1,4-phenylene, which is unsubstituted or substituted with halogen and in which, when it is unsubstituted, optionally 1 or 2 CH group(s) is/are replaced by nitrogen, or trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl; Z.sup.1 and Z.sup.2 each independently signify a single covalent bond, --CH.sub.2 CH.sub.2 --, --COO--, --OOC--, --OCH.sub.2 --, --CH.sub.2 O--, --C.dbd.C--, --(CH.sub.2).sub.4 --, --O(CH.sub.2).sub.3 --, --(CH.sub.2).sub.3 O-- or the trans form of --OCH.sub.2 CH.dbd.CH--, --CH.dbd.CHCH.sub.2 O--, --(CH.sub.2).sub.2 CH.dbd.CH-- or --CH.dbd.CH(CH.sub.2).sub.2 --; n is either 0, 1 or 2; and R.sup.2 is halogen, cyano or alkyl with 1 to 12 carbon atoms, which is optionally substituted with fluorine and in which optionally 1 --CH.sub.2 -- group or 2 non-adjacent --CH.sub.2 -- groups is/are replaced by oxygen, --COO--, --OOC--, --CO-- and/or a --CH.sub.2 --CH.sub.2 -- group is replaced by --CH.dbd.CH--, are useful in electro-optical applications. Liquid crystalline mixtures containing such compounds are especially suitable for use in commercial applications, such as electro-optic cells.