Patent US1587669A successfully refreshed from Google Patents.
Patent US4542230A successfully refreshed from Google Patents.
US4542230A
Expired / Lapsed
US
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Liquid crystals esters
Assignee: BDH Chemicals Ltd
•
Filing: 1980-09-30
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Granted: 1985-09-17
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Expires: 2000-09-30
Abstract
Abstract A liquid crystal ester has a structure: ##STR1## where X and Y are fluorine or hydrogen at least one being hydrogen, and Z is either: (a) ##STR2## where R 2 is alkyl, alkoxy, alkylcarbonyloxy or alkoxycarbonyloxy (b) ##STR3## where R 3 is an alkyl group. The ester may be prepared by a conventional esterification from the corresponding phenol ##STR4## and the corresponding acid chloride Z--COCl. The ester may be used in mixtures with other liquid crystal compounds for use in known electro-optic devices.
Inventors
- 👤 George W. Gray
- 👤 David Lacey
- 👤 Martin G. Pellatt
- 👤 Bennett Sturgeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
42 words
A liquid crystal ester compound having a molecular structure wherein X is fluorine and Y is hydrogen or X is hydrogen and Y is fluorine, R 1 is an alkyl group and Z is ##STR40## where R 3 is an alkyl group.
Claim 2
Dependent Claim
42 words
A liquid crystal ester compound having a molecular structure wherein X is fluorine and Y is hydrogen or X is hydrogen and Y is fluorine, R 1 is an alkyl group and Z is ##STR40## where R 3 is an alkyl group.
Claim 3
Dependent Claim
16 words
A compound as claimed in claim 1 and wherein X is hydrogen and Y is fluorine.
Claim 4
Dependent Claim
16 words
A compound as claimed in claim 1 and wherein X is fluorine and Y is hydrogen.
Claim 5
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 7 H 15 and R 3 is n--C 3 H 7 .
Claim 6
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 5 H 11 and R 3 is n--C 4 H 9 .
Claim 7
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 7 H 15 and R 3 is n--C 4 H 9 .
Claim 8
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 3 H 7 and R 3 is n--C 5 H 11 .
Claim 9
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 5 H 11 and R 3 is n--C 5 H 11 .
Claim 10
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 7 H 15 and R 3 is n--C 5 H 11 .
Claim 11
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 3 H 7 and R 3 is n--C 4 H 9 .
Claim 12
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 4 H 9 and R 3 is n--C 5 H 11 .
Claim 13
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 6 H 13 and R 3 is n--C 5 H 11 .
Claim 14
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 8 H 17 and R 3 is n--C 5 H 11 .
Claim 15
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 9 H 19 and R 3 is n--C 5 H 11 .
Claim 16
Dependent Claim
22 words
A compound as claimed in claim 2 and wherein R 1 is (+)-2-methylbutyl and R 2 is n--C 5 H 11 .
Claim 17
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 3 H 7 and R 3 is n--C 6 H 13 .
Claim 18
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 5 H 11 and R 3 is n--C 6 H 13 .
Claim 19
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 6 H 13 and R 3 is n--C 6 H 13 .
Claim 20
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 7 H 15 and R 3 is n--C 6 H 13 .
Claim 21
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 8 H 17 and R 3 is n--C 6 H 13 .
Claim 22
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 9 H 19 and R 3 is n--C 6 H 13 .
Claim 23
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 3 H 7 and R 3 is n--C 7 H 15 .
Claim 24
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 5 H 11 and R 3 is n--C 7 H 15 .
Claim 25
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 6 H 13 and R 3 is n--C 7 H 15 .
Claim 26
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 7 H 15 and R 3 is n--C 7 H 15 .
Claim 27
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 8 H 17 and R 3 is n--C 7 H 15 .
Claim 28
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 9 H 19 and R 3 is n--C 7 H 15 .
Claim 29
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 11 H 23 and R 3 is n--C 7 H 15 .
Claim 30
Dependent Claim
22 words
A compound as claimed in claim 2 and wherein R 1 is (+)-2-methylbutyl and R 3 is n--C 7 H 15 .
Claim 31
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 3 H 7 and R 3 is n--C 8 H 17 .
Claim 32
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 5 H 11 and R 3 is n--C 8 H 17 .
Claim 33
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 7 H 15 and R 3 is n--C 8 H 17 .
Claim 34
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 5 H 11 and R 3 is n--C 9 H 19 .
Claim 35
Dependent Claim
25 words
A compound as claimed in claim 2 and wherein R 1 is n--C 7 H 15 and R 3 is n--C 9 H 19 .
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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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |