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US3893994A
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4-(Alkyl)-4{40 -(alkoxy or alkylcarbonyloxy)-1,1{40 -azobene
Assignee: Merck Patent GmbH
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Filing: 1973-07-27
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Granted: 1975-07-08
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Expires: 1993-07-27
Abstract
Abstract Azo compounds of the formula WHEREIN X is azo, R is straight-chain alkyl of 3 - 8 carbon atoms, and R'' is straight-chain alkyl of straight-chain alkanoyl, each of 1 - 10 carbon atoms, in pure form and mixtures thereof with each other and with other nematic or non-nematic compounds, have nematic liquid-crystalline phases at low temperatures and exhibit wide nematic mesophases. In their nematic phase, their light scattering property varies proportionately and reversably to the voltage applied thereto, which renders them useful in the production of display screens, in nuclear resonance and electron resonance spectroscopy and as solvents for stereospecific chemical reactions.
Inventors
- 👤 Ralf Steinstrasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:57
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/24; C07; C07C; C07C245/00; C07C245/02; C07C245/06; C07C245/08; G; G01; G01N; G01N24/00; Y; Y10; Y10S; Y10S534/00; Y10S534/02; Y10T; Y10T436/00; Y10T436/24; Y10T436/25; Y10T436/25625
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
11 words
A compound of claim 1, wherein R contains 3-6 carbon atoms.
Claim 4
Dependent Claim
13 words
A compound of claim 1, wherein R'' is alkyl of 1-6 carbon atoms.
Claim 5
Dependent Claim
13 words
A compound of claim 1, wherein R'' is alkanoyl of 4-8 carbon atoms.
Claim 6
Dependent Claim
11 words
A compound of claim 3, wherein R contains 3-6 carbon atoms.
Claim 7
Dependent Claim
11 words
A compound of claim 4, wherein R contains 3-6 carbon atoms.
Claim 8
Dependent Claim
6 words
A compound of claim 1, p-n-propyl-p''-heptanoyloxyazobenzene.
Claim 9
Dependent Claim
6 words
A compound of claim 1, p-n-propyl-p''-octanoyloxyazobenzene.
Claim 10
Dependent Claim
6 words
A compound of claim 1, p-n-butyl-p''-methoxyazobenzene.
Claim 11
Dependent Claim
6 words
A compound of claim 1, p-n-butyl-p''-ethoxyazobenzene.
Claim 12
Dependent Claim
6 words
A compound of claim 1, p-n-butyl-p''-n-pentyloxyazobenzene.
Claim 13
Dependent Claim
6 words
A compound of claim 1, p-n-butyl-p''-n-hexyloxyazobenzene.
Claim 14
Dependent Claim
6 words
A compound of claim 1, p-n-pentyl-p''-methoxyazobenzene.
Claim 15
Dependent Claim
6 words
A compound of claim 1, p-n-hexyl-p''-methoxyazobenzene.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |