Patent US3976591A successfully refreshed from Google Patents.
US3976591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel chemical substance presenting a nematic liquid phase
Assignee: Thales SA
•
Filing: 1973-05-16
•
Granted: 1976-08-24
•
Expires: 1993-05-16
Abstract
Abstract A nematic liquid crystal of high stability, which can be utilized at normal temperatures, is obtained from compounds of the formula ##SPC1## Wherein R is an alkyl group having 1 to 14 carbon atoms, which present at least one nematic phase in the supper cooled liquid state. As a second embodiment, mixtures of the above compound with other nematic compounds formed nematic structures over wide temperature ranges.
Inventors
- 👤 Jean Claude Dubois
- 👤 Annie Zann
- 👤 Jean Claude Lavenu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:52
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
A nematic liquid crystal mixture, which comprises a mixture of an ester of the formula ##SPC7## wherein R represents an alkyl group having 3, 5 or 6 carbon atoms in combination with a compound of the formula ##SPC8## wherein R 1 and R 2 represent C n H 2n +1 --O, C n H 2n +1 --COO, C n H 2n +1 , or C n H 2n +1 --O--COO wherein n is an integer of from 1 to 14.
Claim 2
Dependent Claim
80 words
A nematic liquid crystal mixture, which comprises a mixture of an ester of the formula ##SPC7## wherein R represents an alkyl group having 3, 5 or 6 carbon atoms in combination with a compound of the formula ##SPC8## wherein R 1 and R 2 represent C n H 2n +1 --O, C n H 2n +1 --COO, C n H 2n +1 , or C n H 2n +1 --O--COO wherein n is an integer of from 1 to 14.
Claim 3
Dependent Claim
64 words
The nematic liquid crystal mixture of claim 1 which comprises an ester of the formula: ##SPC9## with a compound of the formula: ##SPC10## wherein R 1 and R 2 represent C n H 2n +1 --O, C n H 2n +1 --COO, C n H 2n +1 , or C n H 2n +1 --O--COO wherein n is an integer from 1 to 14.
References Cited (Backward Citations)
US3773747A
Cited
DE2024269A1
Cited
DE2123175A1
Cited
US3925482A
Cited
DE2139628A1
Cited
US3772210A
Cited
US3876286A
Cited
US3826757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |