US4298528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclohexyl-dioxane liquid crystalline compounds
Assignee: MERECK PATENT FRANKFURTER STRASSE 250 6100 DARMSTADT A Co OF GERMANY GmbH
•
Filing: 1980-03-28
•
Granted: 1981-11-03
•
Expires: 2000-03-28
Abstract
Abstract Novel liquid crystalline compounds having low viscosity, low transition temperatures, positive dielectric anisotropy and extremely low optical birefringence are provided. The compounds are represented by the formula: ##STR1## where R and R 1 can be the same or different straight chain alkyl or alkoxy group and m can be 1 or 2. Guest-host electrooptical displays including a mixture of one or more of the compounds with a suitable pleochroic dye exhibit much improved constrast and low driving voltage while eliminating the need for polarizers and excessive dye additions.
Inventors
- 👤 Nicholas L. Sethofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:28
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/29; C07C29/00; C07C29/132; C07C29/136; C07C29/147; C07C47/00; C07C47/28; C07C47/32; C07D; C07D319/00; C07D319/04; C07D319/06; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3402; C09K19/52; C09K19/60; C07B; C07B2200/00; C07B2200/09; C07C2601/00; C07C2601/12; C07C2601/14; C09K2019/3422
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
An elongated, rod-shaped liquid crystalline compound of the formula: ##STR6## where R and R 1 can be the same or different straight chain alkyl or alkoxy group.
Claim 2
Dependent Claim
27 words
An elongated, rod-shaped liquid crystalline compound of the formula: ##STR6## where R and R 1 can be the same or different straight chain alkyl or alkoxy group.
Claim 3
Dependent Claim
17 words
The liquid crystalline compound of claim 1 wherein R and R 1 are both straight chain alkyls.
Claim 4
Dependent Claim
35 words
An elongated, rod-shaped liquid crystalline compound having an optical birefringence of about 0.05 or lower and having the formula: ##STR7## where R and R 1 can be the same or different straight chain alkyl group.
Claim 5
Dependent Claim
35 words
An elongated, rod-shaped liquid crystalline compound having an optical birefringence of about 0.05 or lower and having the formula: ##STR7## where R and R 1 can be the same or different straight chain alkyl group.
Claim 6
Dependent Claim
16 words
The liquid crystalline compound of claim 3 wherein R is propyl and R 1 is heptyl.
Claim 7
Dependent Claim
19 words
An elongated, rod-shaped liquid crystalline compound having optical birefringence of about 0.005 or lower and having the formula: ##STR8##
Claim 8
Dependent Claim
19 words
An elongated, rod-shaped liquid crystalline compound having optical birefringence of about 0.005 or lower and having the formula: ##STR8##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |