US5301049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device with at least two liquid crystal compounds, one having one not having a cholesteric phase
Assignee: Canon Inc
•
Filing: 1992-04-06
•
Granted: 1994-04-05
•
Expires: 2012-04-06
Abstract
Abstract A liquid crystal device is constituted by (a) a pair of base plates each having an orientation control film thereon, and (b) a liquid crystal composition interposed between the base plates. The liquid crystal composition comprises at least two liquid crystal compounds including at least one liquid crystal compound which has a temperature range in which it shows cholesteric phase. The liquid crystal composition has a temperature range in which it shows cholesteric phase and is placed in chiral smectic phase which has been formed through cholesteric phase on temperature decrease. The liquid crystal composition comprises liquid crystal molecules having long axes forming a pre-tilt in the chiral smectic phase.
Inventors
- 👤 Kazuharu Katagiri
- 👤 Kazuo Yoshinaga
- 👤 Shinjiro Okada
- 👤 Junichiro Kanbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:43
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; C09K19/0225; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/42; C09K19/50; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/137; G02F1/139; G02F1/141; G02F1/133765; G02F1/1341
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
A liquid crystal device, comprising: (a) a pair of base plates each having an orientation control film thereon, and (b) a liquid crystal composition interposed between the base plates; said liquid crystal composition comprising at least two liquid crystal compounds including at least one liquid crystal compound which has a temperature range in which it shows cholesteric phase and at least one liquid crystal compound which does not have a temperature range in which it shows a cholesteric phase; said liquid crystal composition having a temperature range in which it shows cholesteric phase and being placed in chiral smectic phase which has been formed through cholesteric phase on temperature decrease; said liquid crystal composition comprising liquid crystal molecules having long axes forming a pre-tilt in the chiral smectic phase.
Claim 2
Dependent Claim
129 words
A liquid crystal device, comprising: (a) a pair of base plates each having an orientation control film thereon, and (b) a liquid crystal composition interposed between the base plates; said liquid crystal composition comprising at least two liquid crystal compounds including at least one liquid crystal compound which has a temperature range in which it shows cholesteric phase and at least one liquid crystal compound which does not have a temperature range in which it shows a cholesteric phase; said liquid crystal composition having a temperature range in which it shows cholesteric phase and being placed in chiral smectic phase which has been formed through cholesteric phase on temperature decrease; said liquid crystal composition comprising liquid crystal molecules having long axes forming a pre-tilt in the chiral smectic phase.
Claim 3
Dependent Claim
46 words
A liquid crystal device according to claim 1, wherein said liquid crystal composition is placed in chiral smectic phase which has been formed through successive phase transition from isotropic phase, then cholesteric phase, then smectic A phase and to the chiral smectic phase on temperature decrease.
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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) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |