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US4382012A
Expired / Lapsed
US
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Liquid crystalline diketones
Assignee: Merck Patent GmbH
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Filing: 1981-07-16
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Granted: 1983-05-03
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Expires: 2001-07-16
Abstract
Abstract Diketones of the formula <IMAGE> wherein R1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl are liquid crystalline compounds.
Inventors
- 👤 Rudolf Eidenschink
- 👤 Ludwig Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:57
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003; C07; C07C; C07C45/00; C07C45/45; C07C45/455; C07C49/00; C07C49/76; C07C49/782; C07C49/792; C07C49/80; C07C49/813; C07C49/84; C09K19/10; C09K19/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
A liquid crystal dielectric, comprising at least two liquid crystal components, at least one being a diketone of the formula ##STR17## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl.
Claim 2
Dependent Claim
52 words
A liquid crystal dielectric, comprising at least two liquid crystal components, at least one being a diketone of the formula ##STR17## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl.
Claim 3
Dependent Claim
50 words
A composition comprising a diketone of the formula ##STR18## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl and a liquid crystal dielectric doping agent or dichroitic dye.
Claim 4
Dependent Claim
50 words
A composition comprising a diketone of the formula ##STR18## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl and a liquid crystal dielectric doping agent or dichroitic dye.
Claim 5
Dependent Claim
36 words
A liquid crystal dielectric of claim 1 wherein the diketone is of the formula ##STR19## wherein R 1 is alkyl of 1-18 carbon atoms and R 2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms.
Claim 6
Dependent Claim
15 words
A liquid crystalline dielectric of claim 1 wherein the diketone is of the formula ##STR20##
Claim 7
Dependent Claim
15 words
A liquid crystalline dielectric of claim 1 wherein the diketone is of the formula ##STR21##
Claim 8
Dependent Claim
17 words
A liquid crystalline dielectric of claim 1 wherein in the diketone R 2 is C 1-8 alkyl.
Claim 9
Dependent Claim
29 words
In an electro-optical display element having a liquid crystal cell comprising a liquid crystal dielectric, the improvement wherein the dielectric is that of claim 1, 3, 4 or 5.
References Cited (Backward Citations)
US4011173A
Cited
US3947375A
Cited
US3983049A
Cited
US4130502A
Cited
US4154697A
Cited
US4229315A
Cited
GB2031010A
Cited
SU779380A1
Cited
US4297515A
Cited
US4330426A
Cited
US4293193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |