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US4668829A
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Ferroelectric smectic liquid crystals
Assignee: University Patents Inc
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Filing: 1985-09-17
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Granted: 1987-05-26
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Expires: 2005-09-17
Abstract
Abstract Ferroelectric (chiral) smectic liquid crystal compounds having an achiral core and chiral tail units derived from lactic acid possess the desired combination of properties temperature range, ferroelectric polarization, and low orientational viscosity. These newly made compounds exhibit high speed, multistate electro-optic switching properties which make them ideally suited to certain electro-optic and display device applications.
Inventors
- 👤 David M. Walba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:47
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
A compound of the formula: ##STR4## wherein R" is an alkyl containing one to three carbon atoms.
Claim 2
Dependent Claim
17 words
A compound of the formula: ##STR4## wherein R" is an alkyl containing one to three carbon atoms.
Claim 3
Dependent Claim
12 words
The compound according to claim 1 wherein R" is CH 3 .
Claim 4
Dependent Claim
14 words
The compound according to claim 1 wherein R" is CH 2 CH 3 .
Claim 5
Dependent Claim
16 words
The compound according to claim 1 wherein R" is CH 2 CH 2 CH 3 .
Claim 6
Dependent Claim
14 words
The compound according to claim 1 wherein R" is CH(CH 3 ) 2 .
References Cited (Backward Citations)
DE2516515A1
Cited
US4083797A
Cited
US4147651A
Cited
US4195916A
Cited
US4294991A
Cited
US4564694A
Cited
JPS57163596A
Cited
EP0072475A2
Cited
US4528394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |