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Inventor:
McDonnell; Damien G.
Address:
Malvern, GB2
No. of patents:
13
Patents:












Patent Number Title Of Patent Date Issued
RE31715 Liquid crystal compounds October 30, 1984
Novel liquid crystal compounds are disclosed, which are chiral esters based upon the phenol ##STR1## Typical examples are: ##STR2## and mixtures of these compounds have a helical pitch such that the mixtures reflect light of a specific wavelength when illuminated with ord
5498366 Liquid crystal thiol compounds March 12, 1996
5352381 Liquid crystal thiol compounds October 4, 1994
Compounds of formula (I) where R is C.sub.1-15 alkyl, X is hydrogen, fluorine or chlorine, m and n are independently selected 1 or 0, W is C.sub.1-15 alkyl or alkoxy, CN or halogen, rings A and B Are independently selected from phenyl, laterally fluoro- or chloro- substituted phenyl,
4742173 Dithiene derivative May 3, 1988
A metal dithiene of the formula: ##STR1## wherein R.sup.1 is C.sub.3 to C.sub.20 alkyl;R.sup.2 is selected from alkyl, alkylamino, dialkylamino, alkylthio and alkoxy in which each alkyl contains up to 20 carbon atoms;R.sup.3 is H, halogen or a group represented by R.sup.2 ; andM is a met
4668811 Dithiene derivative May 26, 1987
A metal dithiene of the formula: ##STR1## wherein R.sup.1 is C.sub.3 to C.sub.20 alkyl;R.sup.2 is selected from alkyl, alkylamino, dialkylamino, alkylthio and alkoxy in which each alkyl contains up to 20 carbon atoms;R.sup.3 is H, halogen or a group represented by R.sup.2 ;and M is a met
4566759 Laterally fluorinated liquid crystal materials and frequency change devices January 28, 1986
A liquid crystal composition suitable for use as a two-frequency material in a two-frequency switching device comprises a mixture of:a first component comprising at least one diester compound having a formula: ##STR1## where R.sub.1 is an alkyl or alkoxy group, Z is an cycloalkyl or
4544497 Liquid crystal materials containing substituted bicyclo(2,2,2)octanes October 1, 1985
Liquid crystal compositions are described which comprise a mixture of compounds and which includes at least one additive compound characterized in that the composition includes one or more additive compounds of Formula I as follows: ##STR1## wherein R.sub.1 represents an alkyl gr
4483595 Liquid crystal compositions November 20, 1984
A nematic liquid crystal composition suitable for use as the liquid crystal material of a multiplexed twisted nematic electro-optical display comprising a mixture of Components A, B and C as follows:Component A: a high dielectric anisotropy component;Component B: a low dielectric anisotropy
4482472 Liquid crystal materials November 13, 1984
A liquid crystal material which comprises a mixture of compounds includes at least one low viscosity additive compound of Formula (I) as follows:wherein A is selected from: ##STR1## and B is selected from: ##STR2##where R.sub.1 is selected from alkyl, alkoxy, alkylcarbonyloxy and
4468137 Temperature indicating devices August 28, 1984
A temperature indicating device comprising a series of liquid crystal cells each of which contains a liquid crystal material having a different composition, the composition varying from cell-to-cell, and each of which cells exhibits the grandjean state whereby temperature is indicated by
4261652 Liquid crystal compounds and materials and devices containing them April 14, 1981
A novel liquid crystal compound has the molecular structure: ##STR1## where R is an alkyl group, which may contain up to 18 carbon atoms and which may be normal or branched and may contain a chiral center, ##STR2## is a bicyclo (2.2.2) octane ring, --X-- is and Y is a cyano grou
4261651 Liquid crystal compounds April 14, 1981
A liquid crystal compound having the formula: ##STR1## where X is --CH.sub.2.CH.sub.2 -- or CH.sub.2 OY is ##STR2## and R is a straight or branched (possibly chiral) alkyl group having up to 15 carbon atoms.
4219256 Liquid crystal compounds and materials and devices containing them August 26, 1980
A novel liquid crystal compound has the molecular structure: ##STR1## where R is an alkyl group, which may contain up to 18 carbon atoms and which may be normal or branched and may contain a chiral center, ##STR2## is a bicyclo (2.2.2) octane ring, ##STR3## is a phenyl ri










 
 
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