US5122297A
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Tetracyclic benzene derivatives and liquid-crystalline media
Assignee: Merck Patent GmbH
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Filing: 1991-04-25
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Granted: 1992-06-16
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Expires: 2011-04-25
Abstract
Abstract The invention relates to novel tetracyclic benzene derivatives of the formula I ##STR1## in which n is 1 to 7, A is trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene, X is F, Cl, CF 3 , --OCF 3 or --OCHF 2 , and L, Y and Z are each, independently of one another, H or F.
Inventors
- 👤 Volker Reiffenrath
- 👤 Reinhard Hittich
- 👤 Herbert Plach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:55
CPC Classifications
C; C07; C07C; C07C22/00; C07C22/02; C07C22/04; C07C22/08; C07C25/00; C07C25/18; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
45 words
A compound of the formula I ##STR11## wherein n is 1 to 7, A is 3-fluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene, X is F, Cl, CF 3 , --OCF 3 or --OCHF 2 , and L, Y and Z are each, independently of one another, H or F.
Claim 2
Dependent Claim
45 words
A compound of the formula I ##STR11## wherein n is 1 to 7, A is 3-fluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene, X is F, Cl, CF 3 , --OCF 3 or --OCHF 2 , and L, Y and Z are each, independently of one another, H or F.
Claim 3
Dependent Claim
23 words
A compound of claim 1, having the formula Ic ##STR12## in which n, X, Y and Z are as defined in claim 1.
Claim 4
Dependent Claim
23 words
A compound of claim 1, having the formula Id ##STR13## in which n, X, Y and Z are as defined in claim 1.
Claim 5
Dependent Claim
27 words
A method of producing liquid-crystalline media for electrooptical displays, the improvement comprising adding as one or more components of the liquid-crystalline media a compound of claim 1.
Claim 6
Dependent Claim
20 words
A liquid-crystalline medium containing at least two liquid-crystalline components, wherein at least one component is a compound of claim 1.
Claim 7
Dependent Claim
16 words
An electrooptical display based on a liquid-crystal cell which contains a liquid-crystalline medium of claim 7.
Claim 8
Dependent Claim
13 words
A compound of claim 1, wherein n is 2, 3, 4 or 5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |