US3689525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
P-alkoxyphenyl esters of 4-capronyloxy benzoic acid
Assignee: Hoechst AG
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Filing: 1971-02-26
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Granted: 1972-09-05
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Expires: 1991-02-26
Abstract
Abstract N-(4-methoxybenzylidene)-4''-O-n-butyrylaminophenol and 4methoxy- or 4-ethoxybenzylidene-4''-n-butyl aniline form enantiotropic nematic phases which are stable at room temperature or slightly above. If as third component 4-capronylhydroxy benzoic acid-4-4''-alkoxy phenol ester is added wherein alkoxy stands for ethoxy and butoxy, nematic phases are obtained which have melting points below O* C. The new nematogenic mixtures are useful for example as solvents for the NMR-spectroscopy.
Inventors
- 👤 Bruno Scheurle
- 👤 Kans Kelker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:44
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/281; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/22; C09K19/42; C09K19/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
The nematogenic compound 4-capronylhydroxy-benzoic acid-4''-ethoxy-phenyl ester of the formula
Claim 2
Dependent Claim
9 words
The nematogenic compound 4-capronylhydroxy-benzoic acid-4''-butoxy-phenyl ester of the formula
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |