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:
Mar. 26, 1985
Filed:
Apr. 06, 1983
Applicant:
Inventors:
Kenneth J Harrison, Malvern Link, GB;
Edward P Raynes, Malvern Link, GB;
Frances C Saunders, Malvern Wells, GB;
David J Thompson, Manchester, GB;
David F Newton, High Compton, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; C02F / ;
U.S. Cl.
CPC ...
350349 ; 2522991 ; 25229963 ; 260378 ; 260380 ; 260383 ; 350346 ; 3503 / ;
Abstract
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye characterized in that the dye comprises at least one anthraquinone compound free from water-solubilizing and ionic substituents and having the formula: ##STR1## wherein each of R and R.sup.1 independently represents an n-alkyl group having from 4 to 7 carbon atoms inclusive and wherein each of R.sup.2 and R.sup.3 is independently selected from hydrogen and alkyl groups having from 1 to 4 carbon atoms inclusive.