Patent US4356103A successfully refreshed from Google Patents.
US4356103A
Expired / Lapsed
US
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Liquid crystals for electro-optical devices
Assignee: Werk fuer Fernsehelektronik GmbH
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Filing: 1980-05-05
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Granted: 1982-10-26
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Expires: 2000-05-05
Abstract
Abstract Liquid crystal compound for color modulation of light in electro-optical devices characterized by an oriented smectic C-phase with positive dielectric anisotropy. The compound has the property of a dichroitic dyestuff.
Inventors
- 👤 Herrmann Schubert
- 👤 Gerhard Pelzl
- 👤 Horst Zaschke
- 👤 Dietrich Demus
- 👤 Hans-Ulrich Nothni
- 👤 Frank Kuschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:43
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/3475
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
In an electro-optic display employing a smectic liquid crystal composition for modulation of transmitted or reflected light and rendering numerals, symbols, and images in color, the improvement wherein said liquid crystal composition comprises a compound selected from the group consisting of 3,6-bis-(4-n-alkylphenyl)-1,2,4,5-tetrazine, 4-n-alkyl-4'-n-alkoxy-3,6-diphenyl-1,2,4,5-tetrazine, 6-n-alkyl-3-(4-n-alkoxyphenyl)-1,2,4,5-tetrazine, and mixtures thereof, having from one to 12 carbon atoms in the alkyl and alkoxy chains, said composition employed as a planarly oriented, smectic C phase of positive dielectric anisotropy and possessing the properties of a dichroitic dyestuff.
Claim 2
Dependent Claim
82 words
In an electro-optic display employing a smectic liquid crystal composition for modulation of transmitted or reflected light and rendering numerals, symbols, and images in color, the improvement wherein said liquid crystal composition comprises a compound selected from the group consisting of 3,6-bis-(4-n-alkylphenyl)-1,2,4,5-tetrazine, 4-n-alkyl-4'-n-alkoxy-3,6-diphenyl-1,2,4,5-tetrazine, 6-n-alkyl-3-(4-n-alkoxyphenyl)-1,2,4,5-tetrazine, and mixtures thereof, having from one to 12 carbon atoms in the alkyl and alkoxy chains, said composition employed as a planarly oriented, smectic C phase of positive dielectric anisotropy and possessing the properties of a dichroitic dyestuff.
Claim 3
Dependent Claim
25 words
The display of claim 1 wherein the smectic C phase is obtained by cooling an oriented nematic phase of said compound into the smectic range.
Claim 4
Dependent Claim
34 words
The display of claim 2 wherein said compound in the form of the smectic C phase is in admixture with at least one additional compound in the form of the smectic C phase too.
Claim 5
Dependent Claim
21 words
The display of claim 1 additionally comprising a positive dichroitic dyestuff absorbing light in a different spectral range than said compound.
Claim 6
Dependent Claim
10 words
The display of claim 2 wherein said compound is 6-n-heptyl-3-(4-n-pentyloxyphenyl)-1,2,4,5-tetrazine.
Claim 7
Dependent Claim
10 words
The display of claim 2 wherein said compound is 3,6-bis-(4-n-nonylphenyl)-1,2,4,5-tetrazine.
Claim 8
Dependent Claim
10 words
The display of claim 2 wherein said compound is 4-n-octyl-4'-octyloxy-3,6-diphenyl-1,2,4,5-tetrazine.
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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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |