US4931208A
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Ferroelectric chiral smectic liquid crystal composition
Assignee: JNC Corp
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Filing: 1988-08-03
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Granted: 1990-06-05
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Expires: 2008-08-03
Abstract
Abstract A ferroelectric liquid crystal composition having a long helical pitch and a light switching element having a quick response property are provided. This composition comprises (1) at least one member selected from the group consisting of liquid crystal compounds having a smectic C phase and no helical structure and liquid crystal compounds having only a nematic phase as a liquid crystal phase and no helical structure and (2) at least one chiral smectic liquid crystal compound.
Inventors
- 👤 Kenji Furukawa
- 👤 Kanetsugu Terashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/02; C09K19/0225; C09K19/46; C09K19/48
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A ferroelectric chiral smectic liquid crystal composition comprising: (1) 30-99% by weight of at least one member selected from the group consisting of compounds expressed by the general formulas: ##STR109## wherein R 19 represents an alkyl group having 9-18 carbon atoms; R 20 represents an alkyl group having 7-18 carbon atoms; R 23 represents an alkyl or an alkyloxy group having 6-18 carbon atoms; and R 24 represents an alkyl group having 5-18 carbon atoms, said at least one member having a nonchiral smectic C phase, and (2) 70-1% by weight of at least one chiral smectic C liquid crystal compound selected from the group consisting of: ##STR110##
Claim 2
Dependent Claim
108 words
A ferroelectric chiral smectic liquid crystal composition comprising: (1) 30-99% by weight of at least one member selected from the group consisting of compounds expressed by the general formulas: ##STR109## wherein R 19 represents an alkyl group having 9-18 carbon atoms; R 20 represents an alkyl group having 7-18 carbon atoms; R 23 represents an alkyl or an alkyloxy group having 6-18 carbon atoms; and R 24 represents an alkyl group having 5-18 carbon atoms, said at least one member having a nonchiral smectic C phase, and (2) 70-1% by weight of at least one chiral smectic C liquid crystal compound selected from the group consisting of: ##STR110##
Claim 3
Dependent Claim
18 words
A light switching element comprising a ferroelectric chiral smectic liquid crystal composition as set forth 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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |