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US4918213A
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Optically active compound and liquid crystal composition containing same
Assignee: Canon Inc
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Filing: 1988-07-25
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Granted: 1990-04-17
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Expires: 2008-07-25
Abstract
Abstract An optically active, generally mesomorphic compound represented by the following formula (I): ##STR1## wherein R 1 denotes an alkyl group having 1-18 carbon atoms, R 2 denotes an alkyl group having 1-12 carbon atoms; X denotes a single bond, --O--, ##STR2## Y denotes a single bond, ##STR3## --CH 2 O-- or --OCH 2 --; Z denotes --OCH 2 --, ##STR4## respectively denotes ##STR5## C* denotes an asymmetric carbon atom; k, m and n are respectively 0, 1 or 2 with proviso that k+m+n amounts to 2 or 3; and p is 1 or 2.
Inventors
- 👤 Hiroyuki Nohira
- 👤 Masanao Kamei
- 👤 Hideki Kanazawa
- 👤 Yoko Yamada
- 👤 Yuko Etoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:29
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; C09K19/20; C09K19/2007; C09K19/2021; C09K19/30; C09K19/3001; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3463; C09K19/42; C09K19/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
An optically active compound represented by the following formula (I): ##STR112## wherein R 1 denotes an alkyl group having 1-18 carbon atoms, R 2 denotes an alkyl group having 1-12 carbon atoms; X denotes a single bond, --O--, ##STR113## Y denotes a single bond, ##STR114## --CH 2 O-- or --OCH 2 --; Z denotes --OCH 2 --, ##STR115## independently denote ##STR116## C* denotes an asymmetric carbon atom; k, m and n are independently 0, 1 or 2 with proviso that k+m+n is 2 or 3; and p is 1 or 2.
Claim 2
Dependent Claim
91 words
An optically active compound represented by the following formula (I): ##STR112## wherein R 1 denotes an alkyl group having 1-18 carbon atoms, R 2 denotes an alkyl group having 1-12 carbon atoms; X denotes a single bond, --O--, ##STR113## Y denotes a single bond, ##STR114## --CH 2 O-- or --OCH 2 --; Z denotes --OCH 2 --, ##STR115## independently denote ##STR116## C* denotes an asymmetric carbon atom; k, m and n are independently 0, 1 or 2 with proviso that k+m+n is 2 or 3; and p is 1 or 2.
Claim 3
Dependent Claim
84 words
A compound according to claim 1, which is represented by the following formula (I-a): ##STR117## wherein R 1a denotes an alkyl group having 4-16 carbon atoms, R 2a denotes an alkyl group having 1-12 carbon atoms; k, m and n are independently 0, 1 or 2 with proviso that k+m+n is 2 or 3; X a denotes a single bond; Y a denotes a single bond or ##STR118## Za denotes --OCH 2 --, ##STR119## independently denote ##STR120## and C* denotes an asymmetric carbon atom.
Claim 4
Dependent Claim
80 words
A compound according to claim 1, which is represented by the following formula (I-b): ##STR121## wherein R 1b denotes an alkyl group having 1-18 carbon atoms, R 2b denotes an alkyl group having 1-12 carbon atoms; X b denotes a single bond, --O--, ##STR122## Z b denotes --OCH 2 -- or ##STR123## independently denote ##STR124## k, m and n are independently 0, 1 or 2 with proviso that k+m+n is 2 or 3; and C* denotes an asymmetric carbon atom.
Claim 5
Dependent Claim
90 words
A compound according to claim 1, which is represented by the following formula (I-c): ##STR125## wherein R 1c denotes an alkyl group having 1-18 carbon atoms, R 2c denotes an alkyl group having 1-12 carbon atoms; X c denotes a single bond, --O--, ##STR126## Y c denotes --CH 2 O-- or --OCH 2 --; Z c denotes --OCH 2 -- or ##STR127## independently denotes ##STR128## C* denotes an asymmetric carbon atom; and k, m and n are independently 0, 1 or 2 with proviso that k+m+n is 2 or 3.
Claim 6
Dependent Claim
15 words
A compound according to claim 1, which is a compound yielding a liquid crystal phase.
Claim 7
Dependent Claim
15 words
A compound according to claim 5, wherein said liquid crystal phase includes a smectic phase.
Claim 8
Dependent Claim
14 words
A compound according to claim 6, wherein said smectic phase includes smectic A phase.
Claim 9
Dependent Claim
15 words
A compound according to claim 6, wherein said smectic phase includes chiral smectic C phase.
Claim 10
Dependent Claim
19 words
A compound according to claim 5, wherein said liquid crystal phase includes chiral smectic C phase and cholesteric phase.
Claim 11
Dependent Claim
16 words
A compound according to claim 1, which is a compound not yielding a liquid crystal phase.
References Cited (Backward Citations)
GB1603076A
Cited
US4623477A
Cited
US4713197A
Cited
US4621901A
Cited
DE3525015A1
Cited
US4776973A
Cited
EP0213841A2
Cited
EP0224725A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |