US4304683A
Expired / Lapsed
US
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Composition for liquid crystal color display element
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1980-03-10
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Granted: 1981-12-08
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Expires: 2000-03-10
Abstract
Abstract A composition for nematic liquid crystal color display elements, said composition comprising at least one anthraquinonic dye represented by the formula ##STR1## wherein X and X' are the same and represent --NH 2 or --OH, and R represents a linear or branched alkyl group having 1 to 15 carbon atoms, a cyclohexyl group or a group of the formula --R 2 --O--R 3 in which R 2 is an alkylene group having 1 to 3 carbon atoms and R 3 is a linear or branched alkyl group having 1 to 15 carbon atoms dissolved in at least one nematic liquid crystal.
Inventors
- 👤 Ryoichi Morinaka
- 👤 Ryoichi Tukahara
- 👤 Tsutomu Nishizawa
- 👤 Tuneo Hidaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/603; C09B; C09B1/00; C09B1/50; C09B1/503
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A composition for nematic liquid crystal color display elements, said composition comprising at least one nematic liquid crystal and at least one anthraquinonic dye represented by the formula ##STR39## wherein X and X' are the same and represent --NH 2 or --OH, and R represents a linear or branched alkyl group having 1 to 15 carbon atoms, a cyclohexyl group or a group of the formula --R 2 --O--R 3 in which R 2 is an alkylene group having 1 to 3 carbon atoms and R 3 is a linear or branched alkyl group having 1 to 15 carbon atoms, said anthraquinone dye being dissolved in the nematic liquid crystal.
Claim 2
Dependent Claim
110 words
A composition for nematic liquid crystal color display elements, said composition comprising at least one nematic liquid crystal and at least one anthraquinonic dye represented by the formula ##STR39## wherein X and X' are the same and represent --NH 2 or --OH, and R represents a linear or branched alkyl group having 1 to 15 carbon atoms, a cyclohexyl group or a group of the formula --R 2 --O--R 3 in which R 2 is an alkylene group having 1 to 3 carbon atoms and R 3 is a linear or branched alkyl group having 1 to 15 carbon atoms, said anthraquinone dye being dissolved in the nematic liquid crystal.
Claim 3
Dependent Claim
32 words
The composition of claim 1 wherein said anthraquinonic dye is expressed by the following formula ##STR40## wherein R 1 represents a linear or branched alkyl group having 5 to 15 carbon atoms.
Claim 4
Dependent Claim
23 words
The composition of claim 1 or 2 wherein a mixture of said anthraquinonic dyes is dissolved in at least one nematic liquid crystal.
Claim 5
Dependent Claim
23 words
The composition of claim 1 or 2 wherein a mixture of said anthraquinonic dyes is dissolved in a mixture of nematic liquid crystals.
Claim 6
Dependent Claim
30 words
The composition of claim 1 or 2 wherein the concentration of said anthraquinonic dye is 0.01 to 20 percent by weight based upon the weight of the nematic liquid crystal.
Claim 7
Dependent Claim
24 words
The composition of claim 5 wherein said concentration is 0.01 to 3 percent by weight based on the weight of the nematic liquid crystal.
Claim 8
Dependent Claim
17 words
The composition of claim 1 or 2 wherein said nematic liquid crystal has a positive dielectric anisotropy.
Claim 9
Dependent Claim
16 words
The composition of claim 1 or 2 wherein said nematic liquid crystal has negative dielectric anisotropy.
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |