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Patent US4391730A successfully refreshed from Google Patents.
US4391730A
Expired / Lapsed
US
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Nematic liquid crystal compounds and use and device for using the same
Assignee: Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik VEB
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Filing: 1980-09-02
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Granted: 1983-07-05
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Expires: 2000-09-02
Abstract
Abstract A nematic liquid crystal for modulating light in electrooptical devices comprises: A. A 5-substituted-2-(4-substituted-phenyl)-pyrimidine of the formula ##STR1## or a homolog thereof, R 1 and R 2 being the same or different and being selected from the group consisting of C n H 2n+1 --, C n H 2n+1 O--, C n H 2n+1 COO-- or C n H 2n+1 CO-- and n=1 to 12; B. A 4-substituted-cyclohexanecarboxylic acid-(4-substituted-phenylester) of the formula ##STR2## or a homolog thereof, R being --C m H 2m+1 , --OC m H 2m+1 , --COC m H 2m+1 , --CN or --NO 2 , and n, m=1-10, and C. A 4-substituted-benzoic acid-(4-cyanophenylester) of the formula ##STR3## or a homolog thereof, R being C n H 2n+1 -- or C n H 2n+1 O-- and n=1 to 14.
Inventors
- 👤 Frank Kuschel
- 👤 Dietrich Demus
- 👤 Doris Pfeiffer
- 👤 Hans-Joachim Deutscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:08
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A nematic liquid crystal composition for use in electro-optical devices for modulating transmitted or reflected light and for the rendition of numerals, symbols and images, comprising a mixture of at least one compound of formula (A) ##STR10## wherein R 1 is C n H 2n+1 O-- and R 2 is C n H 2n+1 --, where n=1 to 12, and at least one compound of formula (B) ##STR11## where m=1 to 10.
Claim 2
Dependent Claim
72 words
A nematic liquid crystal composition for use in electro-optical devices for modulating transmitted or reflected light and for the rendition of numerals, symbols and images, comprising a mixture of at least one compound of formula (A) ##STR10## wherein R 1 is C n H 2n+1 O-- and R 2 is C n H 2n+1 --, where n=1 to 12, and at least one compound of formula (B) ##STR11## where m=1 to 10.
Claim 3
Dependent Claim
30 words
The composition of claim 1 wherein the individual components are present in the following proportions: component A, 10 to 50 mol % and component B, 30 to 90 mol %.
Claim 4
Dependent Claim
38 words
The composition of claim 1 wherein the individual components are present in the following proportions: component A, 20 to 80 mol % and component B, 10 to 60 mol %, and component C, 20 to 65 mol %.
Claim 5
Dependent Claim
26 words
The composition of claim 1 wherein component A is at least one of a 5-n-alkyl-2-(4-n-alkyloxyphenyl)pyrimidine having from 4 to 9 carbon atoms in the alkyl groups.
Claim 6
Dependent Claim
15 words
The composition of claim 4 wherein component A is a mixture of 5-n-hexyl-2-(4-n-hexyloxyphenyl)-pyrimidine and 5-n-hexyl-2-(4-n-nonyloxyphenyl)-pyrimidine.
Claim 7
Dependent Claim
10 words
The composition of claim 4 wherein component A is 5-n-butyl-2-(4-n-heptyloxyphenyl)pyrimidine.
Claim 8
Dependent Claim
28 words
The composition of claim 1 wherein component B is at least one of a 4-n-alkylcyclohexane carboxylic acid-(4-cyanophenylester) having from 3 to 5 carbon atoms in the alkyl group.
Claim 9
Dependent Claim
22 words
The composition of claim 7 wherein component B is a mixture of the 4-cyanophenylesters of 4-n-propyl-cyclohexanecarboxylic acid, 4-n-butyl-cyclohexanecarboxylic acid, and 4-n-pentyl-cyclohexanecarboxylic acid.
Claim 10
Dependent Claim
10 words
The composition of claim 1 additionally comprising a dichroitic dyestuff.
Claim 11
Dependent Claim
12 words
The composition of claim 9 wherein said dichroitic dyestuff is indophenol blue.
Claim 12
Dependent Claim
44 words
An electro-optical device for modulating transmitted or reflected light and for the rendition of numerals, symbols, and images containing a composition of claim 1 having a melting point equal to or less than approximately 0° C. and a 10% voltage below approximately 2 volts.
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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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |