US3979321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixture of liquid crystals exhibiting positive dielectric anisotropy and a wide mesomorphic range
Assignee: Thales SA
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Filing: 1975-06-11
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Granted: 1976-09-07
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Expires: 1995-06-11
Abstract
Abstract A mixture of liquid crystals comprising a substance which imparts a medium positive dielectric anisotropy, and substances which widen the mesomorphic temperature range or impart good long-term stability, is provided. The mixture in accordance with the invention comprises at least one substance of the formula: ##SPC1## Or its isomer of the formula: ##SPC2## Where R is an alkyl or alkoxy radical and at least one substance of the formula: ##SPC3## Where the radical R is of the same kind as mentioned earlier or substance of the formula: ##SPC4## Or its isomer of the formula: ##SPC5## Where R is an alkoxy radical.
Inventors
- 👤 Andre Couttet
- 👤 Jean Claude Dubois
- 👤 Annie Zann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:44
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; C09K19/42; C09K19/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A eutectic mixture of liquid crystals consisting essentially of at least one compound selected from the formulae: ##SPC9## where R 1 is C 4 H 9 O, C 6 H 13 O or C 8 H 17 O or ##SPC10## where R 2 is C 5 H 11 , C 6 H 13 or C 7 H 15 , and mixtures thereof, mixed with at least one compound selected from the formulae: ##SPC11## and where R 3 is C 6 H 13 O or C 8 H 17 O and mixtures
Claim 2
Dependent Claim
91 words
A eutectic mixture of liquid crystals consisting essentially of at least one compound selected from the formulae: ##SPC9## where R 1 is C 4 H 9 O, C 6 H 13 O or C 8 H 17 O or ##SPC10## where R 2 is C 5 H 11 , C 6 H 13 or C 7 H 15 , and mixtures thereof, mixed with at least one compound selected from the formulae: ##SPC11## and where R 3 is C 6 H 13 O or C 8 H 17 O and mixtures
Claim 3
Dependent Claim
64 words
A eutectic mixture of liquid crystals consisting essentially of at least one compound of the formula: ##SPC12## where R 2 is C 5 H 11 , C 6 H 13 or C 7 H 15 mixed with at least one compound of the formula: ##SPC13## where R 4 is C 5 H 11 , C 3 H 7 O, C 5 H 11 O,
Claim 4
Dependent Claim
64 words
A eutectic mixture of liquid crystals consisting essentially of at least one compound of the formula: ##SPC12## where R 2 is C 5 H 11 , C 6 H 13 or C 7 H 15 mixed with at least one compound of the formula: ##SPC13## where R 4 is C 5 H 11 , C 3 H 7 O, C 5 H 11 O,
Claim 5
Dependent Claim
20 words
A eutectic mixture of liquid crystals as claimed in claim 1, comprising the following substances in the proportions indicated: ##SPC14##
Claim 6
Dependent Claim
20 words
A eutectic mixture of liquid crystals as claimed in claim 1, comprising the following substances in the proportions indicated: ##SPC15##
Claim 7
Dependent Claim
20 words
A eutectic mixture of liquid crystals as claimed in claim 1, comprising the following substances in the proportions indicated: ##SPC16##
Claim 8
Dependent Claim
22 words
A eutectic mixture of liquid crystals as claimed in claim 2, consisting essentially of the following substances in the proportions indicated: ##SPC17##
References Cited (Backward Citations)
DE2306738A1
Cited
US3872140A
Cited
BE807165A
Cited
US3891307A
Cited
JPS49130882A
Cited
DE2321632A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |