US4297515A
Expired / Lapsed
US
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Diketones useful as liquid crystals
Assignee: Merck Patent GmbH
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Filing: 1980-05-09
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Granted: 1981-10-27
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Expires: 2000-05-09
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 19:56
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: 8
Claim 1
Independent Claim
34 words
A diketone of the formula ##STR17## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl.
Claim 2
Dependent Claim
34 words
A diketone of the formula ##STR17## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl of 1-12 carbon atoms; and X is 1,4-trans-cyclohexylene, 1,4-phenylene or 4,4'-cyclohexylphenyl.
Claim 3
Dependent Claim
9 words
A diketone of claim 1, of the formula ##STR18##
Claim 4
Dependent Claim
9 words
A diketone of claim 1, of the formula ##STR19##
Claim 5
Dependent Claim
9 words
A diketone of claim 1, of the formula ##STR20##
Claim 6
Dependent Claim
12 words
A diketone of claim 1 wherein R 2 is C 1-8 alkyl.
Claim 7
Dependent Claim
14 words
A diketone of claim 2, wherein R 1 is alkyl of 1-18 carbon atoms.
Claim 8
Dependent Claim
14 words
A diketone of claim 4, wherein R 1 is alkyl of 1-18 carbon atoms.
References Cited (Backward Citations)
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |