US4952699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-crystalline, 2,5-disubstituted, 1,3,4-thiadiazoles with extended smectic C phases
Assignee: Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik VEB
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Filing: 1988-06-20
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Granted: 1990-08-28
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Expires: 2008-06-20
Abstract
Abstract 2,5-substituted 1,3,4-thiadiazoles of the general formula ##STR1## The aforementioned compounds are used in amounts of 0.1 to 80 mole percent in mixtures for electrooptical arrangements for the modulation of transmitted and reflected light, as well as for the colored or black-and-white display of numerals, symbols and moving or still pictures. The compounds endow the liquid-crystalline mixtures with an extended phase field of the smectic C phase, negative dielectric anisotropy and the property of forming optically active C phases upon admixture with optically active compounds.
Inventors
- 👤 Bak G Yong
- 👤 Dietrich Demus
- 👤 Horst Kresse
- 👤 Annelore Madicke
- 👤 Gerhard Pelzl
- 👤 Wolfgang Schafer
- 👤 Carsten Tschierske
- 👤 Horst Zaschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:33
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/12; C09K19/06; C09K19/34; C09K19/3491; C09K19/3497
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
8 words
A liquid crystalline compound of the formula ##STR60##
Claim 2
Dependent Claim
8 words
A liquid crystalline compound of the formula ##STR60##
Claim 3
Dependent Claim
8 words
A liquid crystalline compound of the formula ##STR61##
Claim 4
Dependent Claim
8 words
A liquid crystalline compound of the formula ##STR61##
Claim 5
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR62##
Claim 6
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR62##
Claim 7
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR63##
Claim 8
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR63##
Claim 9
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR64##
Claim 10
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR64##
Claim 11
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR65##
Claim 12
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR65##
Claim 13
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR66##
Claim 14
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR66##
Claim 15
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR67##
Claim 16
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR67##
Claim 17
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR68##
Claim 18
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR68##
Claim 19
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR69##
Claim 20
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR69##
Claim 21
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR70##
Claim 22
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR70##
Claim 23
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR71##
Claim 24
Dependent Claim
7 words
A liquid crystalline compound of formula ##STR71##
References Cited (Backward Citations)
DD117014A1
Cited
DE3515373A1
Cited
DD240385A1
Cited
DD240386A1
Cited
DD247221A1
Cited
DD247694A1
Cited
WO1988008019A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |