US4419264A
Expired / Lapsed
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Fluorine-containing 4,4'-bis-(cyclohexyl)-biphenyl derivatives, and dielectrics and electro-optical display elements containing them
Assignee: Merck Patent GmbH
•
Filing: 1982-04-30
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Granted: 1983-12-06
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Expires: 2002-04-30
Abstract
Abstract Compounds of the formula ##STR1## wherein R 1 and R 2 are identical or different and each is alkyl or alkoxy each of up to 8 C atoms, and one or two of the substituents X are fluorine and the others are hydrogen are valuable liquid crystalline materials.
Inventors
- 👤 Rudolf Eidenschink
- 👤 Michael Romer
- 👤 Ludwig Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:15
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/12; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003; C07C15/14; C07C17/00; C07C17/093; C07C25/00; C07C25/18; C09K2019/3021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
A compound of the formula ##STR8## wherein R 1 and R 2 are identical or different and each is alkyl or alkoxy each of up to 8 C atoms, and one or two of the substituents X are fluorine and the others are hydrogen.
Claim 2
Dependent Claim
44 words
A compound of the formula ##STR8## wherein R 1 and R 2 are identical or different and each is alkyl or alkoxy each of up to 8 C atoms, and one or two of the substituents X are fluorine and the others are hydrogen.
Claim 3
Dependent Claim
32 words
A compound of claim 1 of the formula ##STR9## wherein R 1 and R 2 are identical or different and each is alkyl or alkoxy each of up to 8 C atoms.
Claim 4
Dependent Claim
32 words
A compound of claim 1 of the formula ##STR10## wherein R 1 and R 2 are identical or different and each is alkyl or alkoxy each of up to 8 C atoms.
Claim 5
Dependent Claim
32 words
A compound of claim 1 of the formula ##STR11## wherein R 1 and R 2 are identical or different and each is alkyl or alkoxy each of up to 8 C atoms.
Claim 6
Dependent Claim
14 words
A compound of claim 1 wherein R 1 and R 2 are straight chained.
Claim 7
Dependent Claim
24 words
A compound of claim 1 wherein one of R 1 and R 2 is straight chained and the other contains only one chain branching.
Claim 8
Dependent Claim
30 words
A liquid-crystalline dielectric useful in electro-optical display elements, which comprises at least two liquid-crystalline components, wherein at least one of these liquid-crystalline components is a 4,4'-dicyclohexylbiphenyl compound of claim 1.
Claim 9
Dependent Claim
18 words
A liquid crystalline dielectric of claim 7 wherein the amount of said 4,4'-dicyclohexylbiphenyl compound is 5-60% by weight.
Claim 10
Dependent Claim
22 words
A liquid crystalline dielectric of claim 7 wherein the amount of said 4,4'-dicyclohexylbiphenyl compound is 0.1 to less than 5% by weight.
Claim 11
Dependent Claim
23 words
In an electro-optical display element comprising a liquid crystal cell, an improvement wherein the liquid crystal cell comprises a dielectric of claim 7.
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |