Liquid-crystal compositions comprising chiral compounds

Patent 7150900 Issued on December 19, 2006. Estimated Expiration Date:

December 16, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Welter, Thomas R.

Application

No. 10737457 filed on 12/16/2003

US Classes:

428/1.3, With viewing layer of specified composition428/1.1, LIQUID CRYSTAL OPTICAL DISPLAY HAVING LAYER OF SPECIFIED COMPOSITION252/299.01, LIQUID CRYSTAL COMPOSITIONS252/299.2, Containing dopant salt252/299.5Containing nonchiral additive having no specified mesophase

Examiners

Primary: Wu, Shean C.

Attorney, Agent or Firm

Konkol; Chris P.

Foreign Patent References

0 307 951 EP 03/01/1989
63-63719 JP 03/01/1988

International Classes

C09K 19/52
C09K 19/38
C09K 19/54
C09K 19/58

Abstract

The invention relates to a class of compounds useful as chiral dopants, which compounds are available in both enantiomeric forms, in liquid-crystal formulations. Such formulations are advantageous in displays and various other products.

Other References

English abstract for JP 63-63719, 1988.
U.S. Appl. No. 10/651,692 08/2003 Welter et al.
Bernhard Kohler et al., “Novel Chiral Macrocycles Containing Two Electronically Interacting Arylene Chromophores,” Chem. Eur. J. 2001, 7, No. 14.
Giovanni Gottarelli and Gian P. Spada, “Induced Cholesteric Mesophases: Origin and Application,” Mol. Cryst. Liq. Cryst., 1985, vol. 123, pp. 377-388.
Gian Piero Spada and Gloria Proni, “The nematic Liquid Crystal Phase as a Probe of the Molecular Shape Helicity,” Enautiomer, vol. 3, pp. 301-314.
Zvonimir Dogic and Seth Fraden, “Cholesteric Phase in Virus Suspensions,” Langmuir 2000,16, 7820-7824.
Birman V. B. et al., “1,1'-Spirobiindane-7,7'-diol: a novel, C2-symmetric chiral ligand”Tetrahedron: Asymmetry, Elsevier Science Publishers, Amsterdam, NL, vol. 10, 1999, pp. 125-131.