Patents by Inventor David Sanderson Hulme

David Sanderson Hulme 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).

  • Liquid crystal compositions
    Patent number: 3974087
    Abstract: A range of eutectic mixtures containing at least three compounds having the formula ##SPC1##Where X.sup.1 is an alkyl group, an alkoxy group or a substituted phenyl group ##SPC2##Where R is an alkyl or alkoxy group, are described. The eutectic mixtures extend the temperature ranges over which their constituent compounds exhibit liquid crystal properties and are thus useful in liquid crystal devices operating in those temperature ranges.
    Type: Grant
    Filed: March 15, 1974
    Date of Patent: August 10, 1976
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: George William Gray, Kenneth John Harrison, David Sanderson Hulme, Edward Peter Raynes