Patents Assigned to Evaluation Research Agency, DRA
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Patent number: 5834455Abstract: Compounds of formula (I) are usefully employed in pharmaceutical compositions either in a mixture or in association with a pharmaceutically acceptable carrier or diluent; ##STR1## wherein M is a diamagnetic metal atom or a diamagnetic metal compound of silicon or a compound of silicon or is 2H; one H being bonded to each of the two nitrogen atoms depicted as being bonded to M (positions 29 and 31 shown); R.sub.1 to R.sub.25 are the same or different and are independently selected from C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkenyl, X--O--Y, (a), X.sup.2 COOX.sup.1, X.sup.2 CONR.sup.1 R.sup.11 and H; wherein X and X.sup.2 are independently selected from a chemical bond, --(CH.sub.2).sub.n -- where n is an integer from 1 to 20 and --(CH.sub.2).sub.a CH.dbd.CH(CH.sub.2).sub.b where a and b are independently selected from integers 0-20 and a+b totals from 0 to 20; X.sup.1 is independently selected from C.sub.1-20 alkyl, C.sub.2-20 alkenyl and H, R.sup.1 and R.sup.11 are independently selected from H, C.sub.Type: GrantFiled: February 13, 1996Date of Patent: November 10, 1998Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland of Defence & Evaluation Research Agency, DRAInventors: David A Russell, Michael J Cook
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Patent number: 5750050Abstract: Liquid crystal compounds have been synthesized of general formula (I) and may be mixed with other liquid crystal compounds to give useful liquid crystal mixtures which may then be used in liquid crystal devices. Such devices include linear and non-linear electrical, optical and electro-optical devices, magneto-optical devices and devices providing responses to stimuli such as temperature changes and total or partial pressure changes. Formula (I) where each Z.sub.1-6 is given by formula (II), where Y for each of Z.sub.1-6 is independently COO, OCO, CH.sub.2 O and OCH.sub.2, m defines the number of substituents on each of Z.sub.1-6 and is independently 0-5,and X is independently for each substituent on each of Z.sub.1-6 alkyl (straight chain, branched and chiral), alkoxy (straight chain, branched or chiral), alkanoyl (straight chain, branched or chiral), alkenyl (straight chain, branched or chiral), halogen, halogenoalkyl (straight chain, branched or chiral) and CN, provided that at least one of Z.sub.Type: GrantFiled: February 28, 1996Date of Patent: May 12, 1998Assignee: Secretary of State for Defence in her Britannic Majesty's Government of the U.K. of Gt. Britain and N. Ireland of Defence Evaluation Research Agency, DRAInventors: John William Goodby, Michael Hird, David Richard Beattie, Paul Hindmarsh, George William Gray, Damien Gerard McDonnell, John Clifford Jones, Timothy Jonathan Phillips
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Patent number: 5741604Abstract: A method of applying a stable intermetallic diffusion barrier layer to a metallic article is described. In many instances, protective coatings are incompatible with the material of the substrate to which they are applied. Such incompatibility is overcome in the invention through in situ formation of an intermediate stable diffusion barrier layer by sequential deposition and subsequent reaction of suitable metals to form a continuous intermetallic layer. A conventional overlay coating may then be applied to the intermetallic layer without risk to the underlying substrate. The invention also contemplates creation of unitary diffusion barriers from multi-layer deposits; deposition of plural diffusion barriers, and formation of complete protective systems comprising substrate, diffusion barrier(s) and overlay coating prior to heat treatment in situ.Type: GrantFiled: October 25, 1995Date of Patent: April 21, 1998Assignee: The Secretary of State for Defence in her Britannic Majesty's Government of the United Kingdom of Great Britain & Northern Ireland of Defence & Evaluation Research Agency,DRAInventors: Martin J. Deakin, John R. Nicholls
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Patent number: 5676878Abstract: A liquid crystal polymer or copolymer is disclosed of structure (A) where X=CN, COR, CO.sub.2 R, CHO, CF.sub.3 ; R=branched chain, straight chain or chiral alkyl; .rect-hollow.=any suitable mesogenic group; Z=single covalent bond, oxygen, sulfur, CO.sub.2 or OCO; n=1 to 20; Y=H, OH, F, OCH.sub.3 ; m=3 to 200; P=a single covalent bond, oxygen, or OCO.Type: GrantFiled: October 5, 1995Date of Patent: October 14, 1997Assignees: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland, Evaluation Research Agency, DRAInventors: David Lacey, Alan W. Hall, Jonathan S. Hill, Damien G. McDonnell