US4402854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystals having pleochroic dyes
Assignee: Siemens AG
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Filing: 1982-09-27
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Granted: 1983-09-06
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Expires: 2002-09-27
Abstract
Abstract Anthraquinone dyes of the general formula: <IMAGE> (A) wherein R1, R3, R4 and R6 are selected from the group consisting of H, OH, OCH3, NO2, NH2 and NHCH3; R2 and R5 are selected from the group consisting of: (a) alkyl-, aryl-, alkaryl-, alkoxyaryl-, aminoaryl-, alkylaminoaryl-, dialkylamino-, arylaminoaryl- or <IMAGE> +TR <IMAGE> <IMAGE> <IMAGE> +TR <IMAGE> wherein R7 is selected from the group consisting of alkyl-, aryl-, amino-, alkylamino-, dialkylamino-, arylamino-, alkyloxy-, and aryloxy radicals, along with their syntheses routes are disclosed. The dyes are particularly useful in liquid crystal displays which function with a "guest host" effect or in other electrooptical display devices having a medium therein switchable between different ordering states.
Inventors
- 👤 Alexander Moeller
- 👤 Gunther Scherowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:09
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/603; C09B; C09B1/00; C09B1/02; C09B1/16; C09B1/20; C09B1/205; C09B1/26; C09B1/32; C09B1/50; C09B1/54; C09B1/542; C09B1/56; C09B1/58; C09B1/585; C09B43/00; C09B43/18; C09B43/20; C09B43/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A liquid crystal composition containing a pleochroic dye wherein the pleochroic dye is an anthraquinone dye having the general formula: ##STR18## wherein R 1 , R 3 , R 4 and R 6 are selected from the group consisting of H, OH, OCH 3 , NO 2 , NH 2 and NHCH 3 ; and R 2 and R 5 are each ##STR19## wherein R 7 is selected from the group consisting of alkyl-, aryl-, amino-, alkylamino-, dialkylamino-, arylamino-, alkyloxy-, and aryloxy radicals.
Claim 2
Dependent Claim
83 words
A liquid crystal composition containing a pleochroic dye wherein the pleochroic dye is an anthraquinone dye having the general formula: ##STR18## wherein R 1 , R 3 , R 4 and R 6 are selected from the group consisting of H, OH, OCH 3 , NO 2 , NH 2 and NHCH 3 ; and R 2 and R 5 are each ##STR19## wherein R 7 is selected from the group consisting of alkyl-, aryl-, amino-, alkylamino-, dialkylamino-, arylamino-, alkyloxy-, and aryloxy radicals.
Claim 3
Dependent Claim
15 words
A liquid crystal composition containing a pleochroic anthraquinone dye wherein said dye comprises a 1,5-diamino-2,6-di-[trans-4-(4n-pentylcyclohexyl)-benzoyloxy]-anthraquinone.
Claim 4
Dependent Claim
15 words
A liquid crystal composition containing a pleochroic anthraquinone dye wherein said dye comprises a 1,5-diamino-2,6-di-[trans-4-(4n-pentylcyclohexyl)-benzoyloxy]-anthraquinone.
Claim 5
Dependent Claim
15 words
A liquid crystal composition containing a pleochroic anthraquinone dye wherein said dye comprises a 2,6-di-[4-(p-N,N-dimethylanilino-azo)benzoyloxy]-anthraquinone.
Claim 6
Dependent Claim
15 words
A liquid crystal composition containing a pleochroic anthraquinone dye wherein said dye comprises a 2,6-di-[4-(p-N,N-dimethylanilino-azo)benzoyloxy]-anthraquinone.
Claim 7
Dependent Claim
15 words
A liquid crystal composition containing a pleochroic anthraquinone dye wherein said dye comprises a 2,6-di[4-(4-pentoxyphenylazo)-benzoyloxy]-anthraquinone.
Claim 8
Dependent Claim
15 words
A liquid crystal composition containing a pleochroic anthraquinone dye wherein said dye comprises a 2,6-di[4-(4-pentoxyphenylazo)-benzoyloxy]-anthraquinone.
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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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |