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:
Nov. 03, 1987
Filed:
Oct. 14, 1983
Hoffmann-La Roche Inc., Nutley, NJ (US);
Abstract
Compounds of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently straight-chain C.sub.1 -C.sub.12 -alkyl or when positioned on an aromatic ring R.sup.1 and R.sup.2 may also independently be straight-chain C.sub.1 -C.sub.12 -alkoxy, or one of R.sup.1 and R.sup.2 may also be a group of the formula: ##STR2## X.sup.1 and X.sup.2 are independently single covalent bonds or one of X.sup.1 and X.sup.2 may also be --CH.sub.2 CH.sub.2 --; rings A.sup.1 and A.sup.2 are independently 1,4-phenylene or, when X.sup.1 or X.sup.2 is --CH.sub.2 CH.sub.2 --, rings A.sup.1 and A.sup.2 may also independently be trans-1,4-cyclohexylene; and R.sup.3 is straight-chain C.sub.1 -C.sub.12 -alkyl or when positioned on an aromatic ring R.sup.3 may also be straight-chain C.sub.1 -C.sub.12 -alkoxy. Their manufacture and use in liquid crystalline mixtures are described.