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US4961876A Expired / Lapsed US ⏱️ 0.0 years remaining

Liquid crystalline ferroelectric derivatives of branched acyclic alpha-chlorocarboxylic acids

Assignee: Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik VEB
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Filing: 1988-09-15
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Granted: 1990-10-09
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Expires: 2008-09-15
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Abstract

Abstract Liquid crystalline ferroelectric derivatives of branched acyclic alpha-chlorocarboxylic acids of the general formula I ##STR1## wherein n=0 or 1; m=0 or 1, o=0 or 1; p=0 or 1 X=--COO--, --OOC--, or --CH 2 --CH 2 -- Y=X, --CH 2 --, --N═N--, or --N═N(O)--, ##STR2## It was discovered that, by reacting chiral alpha-chlorocarboxylic acids or alpha-chlorocarboxylic acid chlorides or bromides, synthesized from natural alpha-amino acids by reaction with nitric and hydrochloric acids, with appropriate hydroxy compounds directly or in the presence of strongly dehydrating substances, preferably carbodiimides, liquid crystalline ferroelectric substances of the general formula I are formed. The inventive substances by themselves, in mixtures with one another as well as with other liquid crystalline substances or substances which are not liquid crystalline, can form liquid crystalline ferroelectric phases, which make them suitable for use in displays.

Inventors

  • 👤 Dietrich Demus
  • 👤 Horst Zaschke
  • 👤 Wolfgang Weissflog
  • 👤 Kristina Mohr
  • 👤 Saskia Kohler
  • 👤 Kerstin Worm

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 18:56
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/30; C09K19/3001; C09K19/34; C09K19/3402; C09K19/3441; C09K19/3444; C09K19/345; C09K19/3458; C09K19/3463; C09K19/3472; C09K19/3483; C09K19/3491; C09K19/3497; C09K2019/3422

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 40 words
Liquid crystalline ferroelectric compounds of the formula ##STR64## wherein R 1 is (CH 3 ) 2 CH--, (CH 3 ) 2 CHCH 2 -- or C 2 H 5 CH(CH 3 )-- and l is an integer 1 to 12.
Claim 2
Dependent Claim 40 words
Liquid crystalline ferroelectric compounds of the formula ##STR64## wherein R 1 is (CH 3 ) 2 CH--, (CH 3 ) 2 CHCH 2 -- or C 2 H 5 CH(CH 3 )-- and l is an integer 1 to 12.
Claim 3
Dependent Claim 21 words
Liquid crystalline ferroelectric compounds as defined in claim 1, in which R 1 is C 2 H 5 CH(CH 3 ).
Claim 4
Dependent Claim 24 words
A liquid crystalline ferroelectric compound as defined in claim 1, in which R 1 is (CH 3 ) 2 CH-- and l is 10.
Claim 5
Dependent Claim 19 words
Liquid crystalline ferroelectric compounds as defined in claim 1, in which R 1 is (CH 3 ) 2 CH--.
Claim 6
Dependent Claim 26 words
In an opto-electronic display containing at least one liquid crystal compound, the improvement in which at least one of said compounds is according to claim 2.
Claim 7
Dependent Claim 26 words
In an opto-electronic display containing at least one liquid crystal compound, the improvement in which at least one of said compounds is according to claim 1.
Claim 8
Dependent Claim 26 words
In an opto-electronic display containing at least one liquid crystal compound, the improvement in which at least one of said compounds is according to claim 3.
Claim 9
Dependent Claim 26 words
In an opto-electronic display containing at least one liquid crystal compound, the improvement in which at least one of said compounds is according to claim 4.

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-10-08 1994-04-09 1994-10-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-10-08 1998-04-09 1998-10-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-10-08 2002-04-09 2002-10-09 $7700.00 Window Closed / Lapsed

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