US4335012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-Substituted-2-(4-cyanophenyl)-1,3-dioxanes
Assignee: Merck Patent GmbH
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Filing: 1981-07-06
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Granted: 1982-06-15
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Expires: 2001-07-06
Abstract
Abstract Compounds of the formula: ##STR1## wherein R is an alkyl, alkoxy, aryl, aryloxy, arylester, carboxy or ester derived from carboxy are used as liquid crystal materials in electro-optical displays. A typical embodiment is 5-butyl-2-(4-cyanophenyl)-1,3-dioxane which has a very low threshold voltage in nematic displays. On rubbed indium oxide surfaces the threshold voltage was 0.6 V using predominately the trans isomer. It was nematic over the range 32.2° C. to 34.6° C.
Inventors
- 👤 Howard Sorkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:36
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3402; C07; C07D; C07D319/00; C07D319/04; C07D319/06; C09K2019/3422
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
29 words
In an electrooptical display including a liquid crystalline material, the improvement wherein the liquid crystalline material comprises a compound of the formula: ##STR9## where R is an alkyl group.
Claim 2
Dependent Claim
29 words
In an electrooptical display including a liquid crystalline material, the improvement wherein the liquid crystalline material comprises a compound of the formula: ##STR9## where R is an alkyl group.
Claim 3
Dependent Claim
31 words
In an electrooptical display including a liquid crystalline material, the improvement wherein the liquid crystalline material comprises a compound of the formula: ##STR10## where R is a straight chain alkyl group.
Claim 4
Dependent Claim
31 words
In an electrooptical display including a liquid crystalline material, the improvement wherein the liquid crystalline material comprises a compound of the formula: ##STR10## where R is a straight chain alkyl group.
Claim 5
Dependent Claim
36 words
In an electrooptical display including a liquid crystalline material, the improvement wherein the liquid crystalline material comprises a compound of the formula: ##STR11## where R is a straight chain alkyl of 1 to 8 carbon atoms.
Claim 6
Dependent Claim
36 words
In an electrooptical display including a liquid crystalline material, the improvement wherein the liquid crystalline material comprises a compound of the formula: ##STR11## where R is a straight chain alkyl of 1 to 8 carbon atoms.
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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) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |