Patent US4647398A successfully refreshed from Google Patents.
US4647398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-crystalline carbonic acid esters and liquid crystal compositions containing same
Assignee: JNC Corp
•
Filing: 1985-01-17
•
Granted: 1987-03-03
•
Expires: 2005-01-17
Abstract
Abstract Novel chiral smectic ester compounds suitable for a display mode utilizing ferroelectric liquid crystals, and liquid crystal compositions containing the same are provided, which compounds are expressed by the formula ##STR1## wherein R represents an alkyl group of 1 to 18 carbon atoms; R* represents an optically active alkyl group of 4 to 18 carbon atoms; X represents either one of a single bond, --O-- ##STR2## A represents ##STR3## and m and n each is 1 or 2.
Inventors
- 👤 Shinichi Saito
- 👤 Hiromichi Inoue
- 👤 Kanetsugu Terashima
- 👤 Takashi Inukai
- 👤 Kenji Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:26
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
54 words
A compound of the formula ##STR30## wherein R represents an alkyl group of 1 to 18 carbon atoms; R* represents an optically active alkyl group of 4 to 18 carbon atoms; X represents a single bond or --O--; A represents ##STR31## and m and n each is 1 or 2 but m+n is 3.
Claim 2
Dependent Claim
54 words
A compound of the formula ##STR30## wherein R represents an alkyl group of 1 to 18 carbon atoms; R* represents an optically active alkyl group of 4 to 18 carbon atoms; X represents a single bond or --O--; A represents ##STR31## and m and n each is 1 or 2 but m+n is 3.
Claim 3
Dependent Claim
10 words
A compound according to claim 1 wherein R* is 2-methylbutyl.
Claim 4
Dependent Claim
12 words
A compound according to claim 1 wherein X represents a single bond.
Claim 5
Dependent Claim
24 words
A chiral smectic liquid crystal composition having at least 2 components at least one of which is a compound set forth in claim 1.
Claim 6
Dependent Claim
18 words
A chiral smectic liquid crystal composition consisting of a plurality of the compounds as defined in claim 1.
References Cited (Backward Citations)
US3790498A
Cited
US3772209A
Cited
US3772210A
Cited
JPS4937352A
Cited
JPS4937351A
Cited
US3951846A
Cited
US4029594A
Cited
US4576732A
Cited
US4589996A
Cited
EP0153826A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |