US4601846A
Expired / Lapsed
US
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Liquid crystal substances for the guest-host effect
Assignee: Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik VEB
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Filing: 1984-04-13
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Granted: 1986-07-22
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Expires: 2004-04-13
Abstract
Abstract The invention relates to liquid crystal compounds for the guest-host effect having a positive contrast, pure red color and exhibiting excellent stability. The compounds herein are derivatives of tetrazine of the general formula: ##STR1## in which m and n are 1 to 10. Other related compounds, mixtures and compositions thereof, and opto-electronic displays are described also.
Inventors
- 👤 Dietrich Demus
- 👤 Horst Zaschke
- 👤 Gerhard Pelzl
- 👤 Hartmut Enzenberg
- 👤 Andreas Isenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:53
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/3475; C07; C07C; C07C327/00; C07D; C07D257/00; C07D257/02; C07D257/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
25 words
Liquid crystal compounds for the guest-host effect which are derivatives of tetrazine of the general formula: ##STR24## and m and n are 1 to 10.
Claim 2
Dependent Claim
25 words
Liquid crystal compounds for the guest-host effect which are derivatives of tetrazine of the general formula: ##STR24## and m and n are 1 to 10.
Claim 3
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR25##
Claim 4
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR26##
Claim 5
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR27##
Claim 6
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR28##
Claim 7
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR29##
Claim 8
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR30##
Claim 9
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR31##
Claim 10
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR32##
Claim 11
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR33##
Claim 12
Dependent Claim
11 words
A liquid crystal substance, according to claim 1, which is ##STR34##
Claim 13
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR35##
Claim 14
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR36##
Claim 15
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR37##
Claim 16
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR38##
Claim 17
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR39##
Claim 18
Dependent Claim
10 words
A liquid-crystal substance, according to claim 1, which is ##STR40##
Claim 19
Dependent Claim
33 words
Liquid crystal mixtures for the guest-host effect which contain about 1 to 15 mol % of at least one derivative of tetrazine according to any one of claims 1 and 2 to 17.
Claim 20
Dependent Claim
44 words
In a positive contrast opto-electronic display component comprising a dye having a negative dichroism and a nematic matrix substance having a positive dielectric anisotropy, the improvement in which the dye is a compound according to any one of claims 1 and 2 to 17.
Claim 21
Dependent Claim
28 words
In a positive contrast opto-electronic display component according to claim 19, the improvement wherein said dye is present in an amount of about 1 to 15 mol %.
Claim 22
Dependent Claim
25 words
A liquid crystal mixture for the guest-host effect according to claim 18, containing 7.2 mol % of ______________________________________
##STR41## ______________________________________
##STR42##
##STR43##
##STR44##
##STR45##
##STR46##
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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) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |