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US4544497A
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Liquid crystal materials containing substituted bicyclo(2,2,2)octanes
Assignee: United States, STATE FOR DEFENCE, Secretary of
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Filing: 1984-01-25
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Granted: 1985-10-01
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Expires: 2004-01-25
Abstract
Abstract Liquid crystal compositions are described which comprise a mixture of compounds and which includes at least one additive compound characterized in that the composition includes one or more additive compounds of Formula I as follows: ##STR1## wherein R 1 represents an alkyl group, R 2 represents an alkyl or alkoxy group or hydrogen and ##STR2## represents a 1,4-disubstituted bicyclo(2,2,2)octane ring. The preparation and properties of novel compounds of Formula I are also described. These liquid crystal compositions are useful in display devices such as digital calculators and word displays.
Inventors
- 👤 Hilal M. Abdullah
- 👤 Jennifer Constant
- 👤 George W. Gray
- 👤 Damien G. McDonnell
- 👤 Kenneth J. Toyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:18
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C07; C07C; C07C1/00; C07C1/20; C07C1/22; C07C13/00; C07C13/28; C07C13/32; C07C13/44; C07C43/00; C07C43/02; C07C43/18; C07C45/00; C07C45/004; C07C45/61; C07C45/67; C07C45/68; C07C49/00; C07C49/29; C07C49/313; C07C49/323; C07C49/385; C07C49/517; C09K19/06; C09K19/32; C09K19/321
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A liquid crystal composition which comprises a mixture of compounds and which includes at least one additive compound of Formula I as follows: ##STR40## wherein R 1 represents an alkyl group, R 2 represents an alkyl or alkoxy group or hydrogen and ##STR41## represents a 1,4-disubstituted bicyclo(2,2,2)octane ring.
Claim 2
Dependent Claim
48 words
A liquid crystal composition which comprises a mixture of compounds and which includes at least one additive compound of Formula I as follows: ##STR40## wherein R 1 represents an alkyl group, R 2 represents an alkyl or alkoxy group or hydrogen and ##STR41## represents a 1,4-disubstituted bicyclo(2,2,2)octane ring.
Claim 3
Dependent Claim
37 words
A composition as claimed in claim 1 wherein in Formula I R 1 is n-alkyl, R 2 is n-alkyl or n-alkoxy and each of R 1 and R 2 independently has from 1 to 12 carbon atoms.
Claim 4
Dependent Claim
23 words
A composition as claimed in claim 2 wherein each of R 1 and R 2 independently has from 1 to 8 carbon atoms.
Claim 5
Dependent Claim
42 words
A composition as claimed in claim 1 wherein the composition comprises a host material including one or more liquid crystal compounds which melt at less than 80° C., the composition exhibiting a nematic or chiral nematic liquid crystal phase at 20° C.
Claim 6
Dependent Claim
26 words
A composition as claimed in claim 1 wherein the at least one compound of Formula I forms between 2% and 50% by weight of the composition.
Claim 7
Dependent Claim
26 words
A composition as claimed in claim 5 wherein the at least one compound of Formula I forms between 5% and 30% by weight of the composition.
Claim 8
Dependent Claim
128 words
A composition as claimed in claim 1 which comprises: Component 1: one or more compounds having a melting point less than 80° C. and a positive dielectric anisotropy, the compound or compounds showing a nematic phase at 20° C.; Component 2: one or more nematic compounds having a clearing point greater than 100° C.; Component 3: one or more compounds showing a dielectric anisotropy magnitude less than 3 and including one or more compounds of Formula I; and Component 4: one or more chiral compounds; the components being in the following proportions by weight: Component 1: 30% to 70% Component 2: 10% to 30% Component 3: 20% to 50% Component 4: 0% to 2% provided the sum of the weight percentages of Components 1 to 4 totals 100%.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |