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US4871469A Expired / Lapsed US ⏱️ 0.0 years remaining

Nematic liquid-crystalline phases

Assignee: Merck Patent GmbH
•
Filing: 1987-04-22
•
Granted: 1989-10-03
•
Expires: 2007-04-22
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Abstract

Abstract The invention relates to the use of trifluorotoluene derivatives of the formula I ##STR1## in which R 1 is alkyl having 1 to 12 carbon atoms in which, in addition, one or more non-neighboring CH 2 groups may be replaced by --O--, --CO--, --O--CO--, --CO--O--, --O--CO--O--, --CH-halogen, --CH--CN-and/or --CH=CH--, A 1 and A 2 , in each case independently of one another, are 1,4-phenylene in which, in addition, one or more CH groups may be replaced by N, trans-1,4-cyclohexylene in which, in addition, one or two non-neighboring CH 2 groups may be replaced by --O--and/or --S--, or 1,4-bicyclo(2,2,2)octylene, each of which is unsubstituted or monosubstituted or poly-substituted by halogen, nitrile and/or CH 3 , Z 1 and Z 2 , in each case independently of one another, are --CO--O--, --O--CO--, --CH 2 O--, --OCH 2 --, --CH 2 CH 2 -- or a single bond, and n is 0 or 1, as components of chiral tilted smectic phases.

Inventors

  • 👤 Volker Reiffenrath
  • 👤 Joachim Krause
  • 👤 Thomas Geelhaar
  • 👤 Rudolf Eidenschink
  • 👤 Hans-Adolf Kurmeier
  • 👤 Eike Poetsch
  • 👤 Bernhard Scheuble
  • 👤 Georg Weber

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 22:09
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3402; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/30; C09K19/3001; C09K19/3003; C09K19/3028; C09K19/3066; C09K19/3068; C09K19/32; C09K19/321; C09K19/3441; C09K19/3444; C09K19/345; C09K19/3458; C09K19/3469; C09K19/3491; C09K2019/3422

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 35 words
A nematic liquid-crystalline phase comprising at least two components, wherein at least one component is a trifluorotoluene derivative selected from the following formulae: ##STR15## wherein R 1 is alkyl having 1 to 12 carbon atoms.
Claim 2
Dependent Claim 35 words
A nematic liquid-crystalline phase comprising at least two components, wherein at least one component is a trifluorotoluene derivative selected from the following formulae: ##STR15## wherein R 1 is alkyl having 1 to 12 carbon atoms.
Claim 3
Dependent Claim 19 words
A liquid-crystalline phase according to claim 1, wherein R 1 is straight-chain alkyl having 2 to 7 carbon atoms.
Claim 4
Dependent Claim 15 words
A liquid-crystalline phase according to claim 1, wherein said at least one component is 1-(trans-4-(trans-4-propylcyclohexyl)-cyclohexyl)-2-(p-trifluorotolyl)-ethane.
Claim 5
Dependent Claim 23 words
In an electrooptical display element which contains a liquid-crystalline phase as a dielectric, the improvement wherein said phase is one of claim 1.

References Cited (Backward Citations)

US4330426A Cited
US4311610A Cited
US4505837A Cited
US4398803A Cited
US4694098A Cited
US4617140A Cited
EP0087679A2 Cited
JPS58177939A Cited
JPS5978148A Cited
WO1986000067A1 Cited
US4684476A Cited
DE3515374A1 Cited
WO1987001717A2 Cited
EP0225195A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-02 1993-04-03 1993-10-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-02 1997-04-03 1997-10-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-02 2001-04-03 2001-10-03 $7700.00 Window Closed / Lapsed

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