US5211878A
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Difluorobenzonitrile derivatives
Assignee: Merck Patent GmbH
•
Filing: 1991-05-14
•
Granted: 1993-05-18
•
Expires: 2011-05-14
Abstract
Abstract Derivatives of 2,3-difluorobenzonitrile of the formula I ##STR1## are useful components of liquid crystalline phases.
Inventors
- 👤 Volker Reiffenrath
- 👤 Joachim Krause
- 👤 Andreas Wachtler
- 👤 Georg Weber
- 👤 Ulrich Finkenzeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:54
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C07; C07C; C07C255/00; C07C255/49; C07C255/50; C07C255/54; C09K19/10; C09K19/12; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
71 words
In a liquid crystalline phase containing at least two liquid crystalline components, the improvement wherein at least one component is a 2,3-difluorobenzonitrile of the formula ##STR6## wherein R is alkyl of 1-12 C atoms or alkyl of 1-12 C atoms in which one or two CH 2 groups ar replaced by --O--, --CO--, --O--CO--, and/or --CH═--, where two O atoms are not directly linked with one another, and A is ##STR7##
Claim 2
Dependent Claim
71 words
In a liquid crystalline phase containing at least two liquid crystalline components, the improvement wherein at least one component is a 2,3-difluorobenzonitrile of the formula ##STR6## wherein R is alkyl of 1-12 C atoms or alkyl of 1-12 C atoms in which one or two CH 2 groups ar replaced by --O--, --CO--, --O--CO--, and/or --CH═--, where two O atoms are not directly linked with one another, and A is ##STR7##
Claim 3
Dependent Claim
13 words
A liquid crystalline phase of claim 1, wherein R is alkyl or alkoxy.
Claim 4
Dependent Claim
12 words
A liquid crystalline phase of claim 2, wherein R is straight chained.
Claim 5
Dependent Claim
13 words
A liquid crystalline phase of claim 3, wherein R is 3-7 C atoms.
Claim 6
Dependent Claim
20 words
A liquid crystalline phase of claim 1, wherein R is alkyl wherein one CH 2 group is replaced by --O--CO--.
Claim 7
Dependent Claim
11 words
A liquid crystalline phase of claim 1, wherein A is ##STR8##
Claim 8
Dependent Claim
21 words
In a liquid crystal display element containing a liquid crystalline phase, the improvement wherein said phase is one of claim 1.
Claim 9
Dependent Claim
23 words
In an electrooptical display element containing a liquid crystalline dielectric, this improvement wherein said dielectric is a liquid crystalline phase of claim 1.
Claim 10
Dependent Claim
12 words
A liquid crystalline phase according to claim 1, wherein A is ##STR9##
Claim 11
Dependent Claim
12 words
A liquid crystalline phase according to claim 1, wherein A is ##STR10##
Claim 12
Dependent Claim
12 words
A liquid crystalline phase according to claim 1, wherein A is ##STR11##
Claim 13
Dependent Claim
71 words
In a liquid crystalline phase containing at least two liquid crystalline components, the improvement wherein at least one component is a 2,3-difluorobenzonitrile of the formula ##STR12## wherein R is alkyl of 1-12 C atoms or alkyl of 1-12 C atoms in which one or two CH 2 groups are replaced by --O--, --CO--, --O--CO--, and/or --CH═CH--, wherein two O atoms are not directly linked with one another, and A is ##STR13##
Claim 14
Dependent Claim
71 words
In a liquid crystalline phase containing at least two liquid crystalline components, the improvement wherein at least one component is a 2,3-difluorobenzonitrile of the formula ##STR12## wherein R is alkyl of 1-12 C atoms or alkyl of 1-12 C atoms in which one or two CH 2 groups are replaced by --O--, --CO--, --O--CO--, and/or --CH═CH--, wherein two O atoms are not directly linked with one another, and A is ##STR13##
Claim 15
Dependent Claim
12 words
A liquid crystalline phase according to claim 12, wherein A is ##STR14##
Claim 16
Dependent Claim
12 words
A liquid crystalline phase according to claim 12, wherein A is ##STR15##
Claim 17
Dependent Claim
12 words
A liquid crystalline phase according to claim 12, wherein A is ##STR16##
Claim 18
Dependent Claim
14 words
A liquid crystalline phase according to claim 12, wherein R is alkyl or alkoxy.
Claim 19
Dependent Claim
13 words
A liquid crystalline phase according to claim 12, wherein R is straight chained.
Claim 20
Dependent Claim
14 words
A liquid crystalline phase according to claim 12, wherein R is 3-7 C atoms.
Claim 21
Dependent Claim
18 words
A liquid crystalline phase according to claim 12, wherein R one CH 2 group is replaced by --O--CO--.
Claim 22
Dependent Claim
21 words
In a liquid crystal display element containing a liquid crystalline phase, the improvement wherein said phase is one of claim 12.
Claim 23
Dependent Claim
23 words
In an electrooptical display element containing a liquid crystalline dielectric, this improvement wherein said dielectric is a liquid crystalline phase of claim 12.
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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) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |