US4906401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of liquid-crystal 5-phenylpyrimidine derivatives as components of smectic liquid-crystal mixtures
Assignee: Hoechst AG
•
Filing: 1989-07-12
•
Granted: 1990-03-06
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Expires: 2009-07-12
Abstract
Abstract The compounds of the general formula (I) ##STR1## are particularly highly suitable as components of smectic, liquid-crystal mixtures, the symbols having the following meaning: R 1 and R 2 denote identical or different, straight-chain or branched alkyl or alkenyl groups which can contain asymmetric carbon atoms, containing 2 to 16 carbon atoms, in which one or more non-adjacent --CH 2 -- groups can be replaced by --O-- and/or --S--, --A and --B each denote group ##STR2## in which the radicals R 1 , R 2 , in each case, are situated at the phenylene part of --A, --B and m and n denote 0 or 1, but m+n is always zero or 1.
Inventors
- 👤 Hans-Rolf Dubal
- 👤 Claus Escher
- 👤 Wolfgang Hemmerling
- 👤 Ingrid Muller
- 👤 Dieter Ohlendorf
- 👤 Rainer Wingen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:12
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
Smectic, liquid-crystal mixtures, comprising compounds of the formula (I) ##STR10## in which X is a single bond, --O or --S, and R 3 and R 4 are identical or different, straight-chain or branched alkyl groups having 7 to 14 carbon atoms which can contain asymmetric carbon atoms.
Claim 2
Dependent Claim
47 words
Smectic, liquid-crystal mixtures, comprising compounds of the formula (I) ##STR10## in which X is a single bond, --O or --S, and R 3 and R 4 are identical or different, straight-chain or branched alkyl groups having 7 to 14 carbon atoms which can contain asymmetric carbon atoms.
Claim 3
Dependent Claim
11 words
Mixtures as claimed in claim 1, having chiral, smectic liquid-crystal phases.
Claim 4
Dependent Claim
12 words
Mixtures as claimed in claim 1, having chiral, tilted smetic liquid-crystal phases.
Claim 5
Dependent Claim
14 words
Mixtures as claimed in claim 1, having chiral, smetic C phases (S c *).
Claim 6
Dependent Claim
58 words
Smectic, liquid-crystal mixtures having S c or S c * phases comprising a combination of compounds of formula (I) as claimed in claim 1 with compounds of the formula (II), ##STR11## in which X is a single bond or --O, and R 5 and R 6 are identical or different alkyl groups having 6 to 15 carbon atoms.
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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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |