US4173545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal with high negative dielectric anisotropy and mixtures of the same with nematic liquid crystals for improving dynamic scattering in electro-optic devices
Assignee: Thales SA
•
Filing: 1978-06-06
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Granted: 1979-11-06
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Expires: 1998-06-06
Abstract
Abstract A liquid crystal composition with high negative dielectric anisotropy, which is capable of exhibiting a high dynamic light scattering effect and of inducing similar characteristics into mixtures of the liquid crystal and another nematic liquid crystal and which derives an advantage from a larger mesomorphic temperature range, which comprises at least one compound of the formula: ##STR1## wherein R represents NO 2 , bromine or cyano; R 1 is an alkyl or alkoxy group and R 2 is an alkyl group.
Inventors
- 👤 Alain Beguin
- 👤 Jean-Claude Dubois
- 👤 Annie Zann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:32
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
8 words
A liquid crystal compound having the formula ##STR15##
Claim 2
Dependent Claim
8 words
A liquid crystal compound having the formula ##STR15##
Claim 3
Dependent Claim
8 words
A liquid crystal compound having the formula ##STR16##
Claim 4
Dependent Claim
8 words
A liquid crystal compound having the formula ##STR16##
Claim 5
Dependent Claim
8 words
A liquid crystal compound having the formula ##STR17##
Claim 6
Dependent Claim
8 words
A liquid crystal compound having the formula ##STR17##
Claim 7
Dependent Claim
8 words
A liquid crystal compound having the formula ##STR18##
Claim 8
Dependent Claim
8 words
A liquid crystal compound having the formula ##STR18##
Claim 9
Dependent Claim
58 words
A liquid crystal composition, which comprises: a nematic liquid crystal having a positive dielectric anisotropy measured at 25° and 5 KHz of the formula ##STR19## and an amount of the compound of any of claims 1, 2, 3 or 4 sufficient such that the overall composition possesses a negative dielectric anisotropy, measured at 25° C. and 5 KHZ.
Claim 10
Dependent Claim
29 words
The composition of claim 5, which comprises 10 wt.% of a compound of the formula: ##STR20## and 90 wt.% of said nematic liquid crystal having a positive dielectric anisotropy.
Claim 11
Dependent Claim
29 words
The composition of claim 5, which comprises 10 wt.% of a compound of the formula: ##STR21## and 90 wt.% of said nematic liquid crystal having a positive dielectric anisotropy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |