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US4874544A Expired / Lapsed US ⏱️ 0.0 years remaining

Ferroelectric liquid crystals

Assignee: Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik VEB
•
Filing: 1988-02-03
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Granted: 1989-10-17
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Expires: 2008-02-03
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Abstract

Abstract Fast-switching displays with memory properties are provided, which can display digits, symbols, and images, and which contain as chemically and thermally stable ferroelectric liquid crystalline substances, according to the invention, liquid crystalline derivatives which contain a chiral alkyl halide residue corresponding to the general formula ##STR1## are used in mixtures of one another as well as in conjunction with other liquid crystalline or non-crystalline liquid substances.

Inventors

  • 👤 Bak G. Yong
  • 👤 Barth Petra
  • 👤 Demus Dietrich
  • 👤 Joachimi Detlev
  • 👤 Barbara Kampa
  • 👤 Saskia Kohler
  • 👤 Kristine Mohr
  • 👤 Reinhard Paschke
  • 👤 Gerhard Pelzl
  • 👤 Ulrich Rosenfeld
  • 👤 Wolfgang Schafer
  • 👤 Klaus-Dieter Scherf
  • 👤 Carsten Tschirske
  • 👤 Wolfgang Weissflog
  • 👤 Horst Zaschke

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 22:37
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C07D249/00; C07D249/16; C07D249/18; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/36; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/12; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/20; C09K19/2007; C09K19/34; C09K19/3441; C09K19/42

Claims Analysis

Total Claims: 19
Claim 1
Independent Claim 86 words
A chiral halogenated alkyl group containing ferroelectric liquid crystal compound of the formula ##STR43## wherein R 1 is C l H 2l+1 --, (CH 3 ) 2 CH--, (CH 3 ) 2 CH--CH2--, or C 2 H 5 --CH(CH 3 )--, in which l=3-12, R 2 is C k H 2k+1 -- or C k H 2k+1 O--, in which k=1-12, X is Cl or F, ##STR44## with the proviso that if ##STR45## is ##STR46## R 1 is only C 2 H 5 --CH(CH 3 )--.
Claim 2
Dependent Claim 86 words
A chiral halogenated alkyl group containing ferroelectric liquid crystal compound of the formula ##STR43## wherein R 1 is C l H 2l+1 --, (CH 3 ) 2 CH--, (CH 3 ) 2 CH--CH2--, or C 2 H 5 --CH(CH 3 )--, in which l=3-12, R 2 is C k H 2k+1 -- or C k H 2k+1 O--, in which k=1-12, X is Cl or F, ##STR44## with the proviso that if ##STR45## is ##STR46## R 1 is only C 2 H 5 --CH(CH 3 )--.
Claim 3
Dependent Claim 9 words
A compound according to claim 1, in which ##STR47##
Claim 4
Dependent Claim 9 words
A compound according to claim 1, which is ##STR48##
Claim 5
Dependent Claim 9 words
A compound according to claim 1, which is ##STR49##
Claim 6
Dependent Claim 9 words
A compound according to claim 1, which is ##STR50##
Claim 7
Dependent Claim 9 words
A compound according to claim 1, which is ##STR51##
Claim 8
Dependent Claim 9 words
A compound according to claim 1, which is ##STR52##
Claim 9
Dependent Claim 9 words
A compound according to claim 1, which is ##STR53##
Claim 10
Dependent Claim 11 words
A compound according to claim 1, in which ##STR54## wherein k=1-12.
Claim 11
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 1.
Claim 12
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 2.
Claim 13
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 3.
Claim 14
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 4.
Claim 15
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 5.
Claim 16
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 6.
Claim 17
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 7.
Claim 18
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 8.
Claim 19
Dependent Claim 15 words
A fast switching display device with memory properties containing a compound according to claim 9.

References Cited (Backward Citations)

US4657695A Cited
US4592858A Cited
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US4725686A Cited
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US4765924A Cited
WO1987005018A2 Cited
EP0248335A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-16 1993-04-17 1993-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-16 1997-04-17 1997-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-16 2001-04-17 2001-10-17 $7700.00 Window Closed / Lapsed

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