Title: Birefringent compounds used in Kerr cells

Abstract: Molecules with a group X which attracts electrons and comprises .pi.-electrons and conjugated therewith a group R which supplies electrons, of the formula R -- X in which X represents --COCF.sub.3, --COC.sub.6 H.sub.5 or --SO.sub.n CF.sub.3, n being 0 or 2, and R represents phenyl or (CH.sub.3).sub.2 N, as electrooptically active liquid inter alia have the advantage that they are achromatic compared with nitrobenzene.

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Inventors: Kruger, Uwe (Hamburg-Schenefeld, DT)

Application Number: 523329
Filing Date: 1974-11-13
Publication_date: 1976-03-02
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 359/253 252/583, 252/585, 359/258, 359/322
Other Classes:
US Patent Ref:

3408133

Oct, 1968

Lee

350/150.

Other Refs:
Primary Examiner: Sebastian, Leland A.
Assistant Examiner: Leland, David
Attorney: Trifari; Frank R., Spain; Norman N.