US4704005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dicyano compounds
Assignee: F Hoffmann La Roche AG
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Filing: 1983-10-14
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Granted: 1987-11-03
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Expires: 2003-10-14
Abstract
Abstract Compounds of the formula: <IMAGE> I wherein R1 and R2 are independently straight-chain C1-C12-alkyl or when positioned on an aromatic ring R1 and R2 may also independently be straight-chain C1-C12-alkoxy, or one of R1 and R2 may also be a group of the formula: <IMAGE> II X1 and X2 are independently single covalent bonds or one of X1 and X2 may also be -CH2CH2-; rings A1 and A2 are independently 1,4-phenylene or, when X1 or X2 is -CH2CH2-, rings A1 and A2 may also independently be trans-1,4-cyclohexylene; and R3 is straight-chain C1-C12-alkyl or when positioned on an aromatic ring R3 may also be straight-chain C1-C12-alkoxy. Their manufacture and use in liquid crystalline mixtures are described.
Inventors
- 👤 Arthur Boller
- 👤 Martin Petrzilka
- 👤 Martin Schadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:44
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/14; C09K19/30; C09K19/3001; C09K19/3003; C09K19/3028; C09K19/34
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
A compound of the formula: ##STR29## wherein R 1 and R 2 are independently straight-chain C 1 -C 12 -alkyl or R 2 may also independently be straight-chain C 1 -C 12 -alkoxy, and ring A 1 is trans-1,4-cyclohexylene.
Claim 2
Dependent Claim
39 words
A compound of the formula: ##STR29## wherein R 1 and R 2 are independently straight-chain C 1 -C 12 -alkyl or R 2 may also independently be straight-chain C 1 -C 12 -alkoxy, and ring A 1 is trans-1,4-cyclohexylene.
Claim 3
Dependent Claim
25 words
The compound of claim 1, wherein R 1 is straight-chain C 1 -C 12 -alkyl and R 2 is straight-chain C 1 -C 12 -alkoxy.
Claim 4
Dependent Claim
18 words
The compound of claim 1, wherein R 1 and R 2 are straight-chain C 1 -C 12 -alkyl.
Claim 5
Dependent Claim
10 words
The compound of claim 1, wherein the compound is 2,3-dicyano-1-[2-(trans-4-pentylcyclohexyl)ethyl]-4-propyl-benzene.
Claim 6
Dependent Claim
10 words
The compound of claim 1, wherein the compound is 2,3-dicyano-1-[2-(trans-4-pentylcyclohexyl)ethyl]-4-butylbenzene.
Claim 7
Dependent Claim
56 words
A liquid crystalline mixture comprising (a) at least one compound of the formula: ##STR30## wherein R 1 and R 2 are independently straight-chain C 1 -C 12 -alkyl; or R 2 may also independently be straight-chain C 1 -C 12 -alkoxy; and ring A 1 is trans-1,4-cyclohexylene; and (b) at least one additional liquid crystalline substance.
Claim 8
Dependent Claim
56 words
A liquid crystalline mixture comprising (a) at least one compound of the formula: ##STR30## wherein R 1 and R 2 are independently straight-chain C 1 -C 12 -alkyl; or R 2 may also independently be straight-chain C 1 -C 12 -alkoxy; and ring A 1 is trans-1,4-cyclohexylene; and (b) at least one additional liquid crystalline substance.
Claim 9
Dependent Claim
28 words
The liquid crystalline mixture of claim 6 wherein the additional liquid crystalline substance is a liquid crystalline carrier material having a dielectric anisotropy of at most about +1.
Claim 10
Dependent Claim
108 words
The liquid crystalline mixture of claim 6 comprising three components A, B and C, each of which comprises at least one compound, wherein component A has a viscosity of at most about 40 cp, a clearing point of at least about 40° C. and a dielectric anisotropy between about -2 and about +1, component B has a dielectric anisotropy below about -2 and comprises at least one compound of formula I, and component C has a dielectric anisotropy above about +10, a clearing point of at least about 100° C. and a cross-over frequency in the total mixture of at most about 15 kHz at about 20° C.
Claim 11
Dependent Claim
72 words
An electro-optical cell comprising: (a) two plate means; (b) a liquid crystal means disposed between the two plate means and including a compound of the formula: ##STR31## wherein R 1 and R 2 are independently straight-chain C 1 -C 12 -alkyl or R 2 may also independently be straight-chain C 1 -C 12 -alkoxy, and ring A 1 is trans-1,4-cyclohexylene; and (c) means for applying an electrical potential to said plate means.
Claim 12
Dependent Claim
72 words
An electro-optical cell comprising: (a) two plate means; (b) a liquid crystal means disposed between the two plate means and including a compound of the formula: ##STR31## wherein R 1 and R 2 are independently straight-chain C 1 -C 12 -alkyl or R 2 may also independently be straight-chain C 1 -C 12 -alkoxy, and ring A 1 is trans-1,4-cyclohexylene; and (c) means for applying an electrical potential to said plate means.
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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) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |