Patents by Inventor Robert Clemitson

Robert Clemitson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Nematic liquid crystal mixtures and fluorinated chloroterphenyls
    Patent number: 5328644
    Abstract: Disclosed is a nematic liquid crystal mixture having a positive dielectric anisotropy .DELTA..epsilon. of at least +4 and a birefringence .DELTA.n of at least 0.18, said mixture comprising at least one fluorinated chloroterphenyl compound of formula IR--E--Cl IwhereinR is an alkyl or alkenyl radical having up to 15 C atoms, said radical being unsubstituted or substituted by halogen, one or more CH.sub.2 groups in the radical optionally being replaced, in each case independently of one another, by --O--, ##STR1## in such a manner that oxygen atoms are not linked directly to one another, andis ##STR2## or the mirror image thereof, and wherein the benzene rings can be optionally further substituted by fluorine.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: July 12, 1994
    Assignee: Merck Patent Gesellschaft
    Inventors: Mark Goulding, Simon Greenfield, David Coates, Robert Clemitson
  • Pyridine derivatives
    Patent number: 5205962
    Abstract: The invention relates to pyridine derivatives of the formula I ##STR1## wherein R.sup.1, A.sup.1, E.sup.1, n, A.sup.2, Z.sup.2, X and Y have the meaning given in claim 1.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: April 27, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: David Coates, Simon Greenfield, Ian C. Sage, Robert Clemitson, Herbert Plach, Volker Reiffenrath