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Patent US4482473A successfully refreshed from Google Patents.
US4482473A
Expired / Lapsed
US
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Liquid crystal mixture
Assignee: Alps Alpine Co Ltd
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Filing: 1982-09-30
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Granted: 1984-11-13
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Expires: 2002-09-30
Abstract
Abstract A liquid crystal mixture comprising a nematic liquid crystal having negative dielectric anisotropy, an optically active substance such as cholesteric or chiralnematic liquid crystal, a dichroic dye and an ionic substance characterized by use of a hexadecylpyridinium salt having the following structural formula as the ionic substance ##STR1## where X is a halogen atom.
Inventors
- 👤 Fumiaki Yamanashi
- 👤 Yuzo Hayashi
- 👤 Yoshiyuki Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:17
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
40 words
A liquid crystal mixture comprising a nematic liquid crystal having negative dielectric anisotropy, an optically active cholesteric or chiralnematic liquid crystal, a dichroic dye and a hexadecylpyridinium salt, having the following structural formula, ##STR6## wherein X is a halogen atom.
Claim 2
Dependent Claim
40 words
A liquid crystal mixture comprising a nematic liquid crystal having negative dielectric anisotropy, an optically active cholesteric or chiralnematic liquid crystal, a dichroic dye and a hexadecylpyridinium salt, having the following structural formula, ##STR6## wherein X is a halogen atom.
Claim 3
Dependent Claim
25 words
The liquid crystal mixture as defined in claim 1 wherein said nematic liquid crystal is a liquid crystal substance consisting principally of a cyclohexanecarboxylate ester.
Claim 4
Dependent Claim
13 words
The liquid crystal mixture as defined in claim 1 wherein X is Br.
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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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |