Patents by Inventor Roland Rich

Roland Rich 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).

  • Disubstituted ethanes
    Patent number: 4439015
    Abstract: Disubstituted ethanes of the formula ##STR1## wherein R.sup.2 is --R.sup.3, --OR.sup.3, --CO--R.sup.3, --CO--OR.sup.3 or O--CO--R.sup.3, R.sup.1 and R.sup.3 each are straight-chain alkyl of 1 to 12 carbon atoms and n is 1 or 2,are described. Liquid crystalline mixtures comprising Compound I as well as their use in electro-optical devices also are disclosed.
    Type: Grant
    Filed: January 22, 1982
    Date of Patent: March 27, 1984
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Roland Rich, Alois Villiger, Erich Widmer