Ester compounds and their use in liquid crystalline media

Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified...

Reexamination Certificate

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C252S299610, C252S299630, C252S299640, C252S299650, C252S299660, C549S369000, C549S372000, C560S065000, C560S083000, C570S129000, C570S131000

Reexamination Certificate

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07074462

ABSTRACT:
The invention relates to compounds of the formula I and to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula Iin whichR, A1, A2, Z1, Y, Z, L1, L2and m are as defined herein.

REFERENCES:
patent: 6159393 (2000-12-01), Tarumi et al.
patent: 19859421 (2000-06-01), None
patent: 0786508 (1997-07-01), None
patent: 0786509 (1997-07-01), None
patent: 0820976 (1998-01-01), None
patent: 0844229 (1998-05-01), None
patent: 0846670 (1998-06-01), None
patent: 1010687 (2000-06-01), None
patent: WO 92/05230 (1992-04-01), None
patent: WO 96/05159 (1996-02-01), None

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