US4753752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary alcohol derivatives for use in liquid crystal materials and devices
Assignee: BDH Ltd
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Filing: 1986-08-18
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Granted: 1988-06-28
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Expires: 2006-08-18
Abstract
Abstract Novel compounds for use in ferroelectric smectic liquid crystal mixtures are provided, having a general formula: <IMAGE> where R1 is alkyl, alkoxy, alkylcarbonyloxy or alkoxy-carbonyl, <IMAGE> are cyclic groups, A and B are a single bond, COO, OOc, CH2CH2, CH2O or OCH2, (a+b+c) is 2 or 3 and R2 is an optically active alkyl group. Ferroelectric smectic liquid crystal mixtures containing these compounds, and a suitable ferroelectric liquid crystal device are also described.
Inventors
- 👤 Edward P. Raynes
- 👤 Ian C. Sage
- 👤 John S. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:45
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/126; C09K19/30; C09K19/3001; C09K19/34; C09K19/3441
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A ferroelectric smectic liquid crystal material characterized in that it is a mixture of at least two compounds, at least one of which is a compound of formula: ##STR36## where R* is an optically active alkyl group of structure ##STR37## where x is in the range 2 to 10, and R* 2 is an optically active alkyl group of structure ##STR38## where m is an integer in the range 1 to 5 and n is an integer in the range 1 to 20 provided that m is not equal to n.
Claim 2
Dependent Claim
91 words
A ferroelectric smectic liquid crystal material characterized in that it is a mixture of at least two compounds, at least one of which is a compound of formula: ##STR36## where R* is an optically active alkyl group of structure ##STR37## where x is in the range 2 to 10, and R* 2 is an optically active alkyl group of structure ##STR38## where m is an integer in the range 1 to 5 and n is an integer in the range 1 to 20 provided that m is not equal to n.
Claim 3
Dependent Claim
26 words
A ferroelectric smectic liquid crystal material according to claim 1, characterized in that R* and R* 2 are both --CH(CH 3 )C 6 H 13 .
Claim 4
Dependent Claim
50 words
A ferroelectric smectic liquid crystal material according to claim 1 or claim 2, characerized in that it contains in addition one or more compounds of a formula selected from the class consisting of ##STR39## where R 4 and R 5 represent alkyl or alkoxy containing 3 to 12 carbon atoms.
Claim 5
Dependent Claim
22 words
A ferroelectric smectic liquid crystal material according to claim 3, characterized in that it contains a mixture of the two compounds ##STR40##
Claim 6
Dependent Claim
28 words
An electro-optical device, operating by a ferroelectric effect in a liquid crystal material, characterized in that the liquid crystal material is a material as claimed in claim 1.
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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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |