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US4046708A
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Mixture of nematic liquid crystals exhibiting a positive dielectric anisotropy and a wide temperature range
Assignee: Thales SA
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Filing: 1974-11-25
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Granted: 1977-09-06
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Expires: 1994-11-25
Abstract
Abstract A nematic liquid crystal for display devices, capable of presenting a helical structure in a wide temperature range down to -10° C, is provided. This is a mixture of substances taken from two groups of the formulae: ##STR1## wherein n is an integer from 1 to 12.
Inventors
- 👤 Jean-Claude Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:46
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A mixture of nematic liquid crystals consisting essentially of about two moles of: ##STR5## about one mole of: ##STR6##about one mole of: the mixture having a nematic range of about 0° C. to 70° C.
Claim 2
Dependent Claim
35 words
A mixture of nematic liquid crystals consisting essentially of about two moles of: ##STR5## about one mole of: ##STR6##about one mole of: the mixture having a nematic range of about 0° C. to 70° C.
Claim 3
Dependent Claim
27 words
A mixture of nematic liquid crystals consisting essentially of equal molar quantities of: ##STR7## the mixture having a nematic range of about -10° C. to +70° C.
Claim 4
Dependent Claim
27 words
A mixture of nematic liquid crystals consisting essentially of equal molar quantities of: ##STR7## the mixture having a nematic range of about -10° C. to +70° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |