The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1997
Filed:
May. 02, 1995
Claus Escher, Muhltal, DE;
Hans-Rolf Dubal, Konigstein/Taunus, DE;
Takamasa Harada, Inzai-machi, JP;
Wolfgang Hemmerling, Sulzbach, DE;
Gerhard Illian, Frankfurt am Main, DE;
Ingrid Muller, Niedernhausen, DE;
Mikio Murakami, Kakegawa, JP;
Dieter Ohlendorf, Liederbach, DE;
Rainer Wingen, Hattersheim am Main, DE;
Hoechst Aktiengesellschaft, Frankfurt, DE;
Abstract
Ferroelectric liquid-crystal systems having high spontaneous polarization, in particular >35 nC cm.sup.-2, and good orientation properties in the ferroelectric phase, in particular the S.sub.C * phase, contain at least three different optically active compounds, preferably as dopes in a base mixture which is not itself optically active and has a nematic phase above the smectic phase. The optically active compounds are selected so that they do not all induce a helix of the same rotation sense in the nematic phase. Their relative concentrations are selected so that the total resultant pitch of the helix throughout the cholesteric phase is not less than 10 .mu.m.