US3960753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent liquid crystals
Assignee: RCA Corp
•
Filing: 1974-05-30
•
Granted: 1976-06-01
•
Expires: 1994-05-30
Abstract
Abstract Liquid crystal compositions compositions and liquid crystal thermometric articles, radiation sensors, and optical display devices comprised of a nematic liquid crystal solvent which is effectively transparent to radiation of near ultraviolet and visible wavelengths and a fluorescent solute whose visible fluorescent intensity varies with the phase or orientation of the liquid crystal solvent are disclosed.
Inventors
- 👤 Robert Dean Larrabee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:27
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13762; C; C09; C09K; C09K11/00; C09K11/06; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; C09K19/52; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A composition which exhibits fluorescent intensity variations at its solid to mesomorphic or mesomorphic to isotropic phase transition comprising a solution of one or a mixture of liquid crystal compounds of the formula ##SPC7## wherein R is C n H 2n +1 -- or C n H 2n +1 CO-- and n is an integer from 1-10 and an amount of 2, 4, 6-trimethylpyridinium tetrakis [1, 1, 1-trifluoro-4-(p-trifluoromethylphenyl)-2, 4-butenedioxo] europium III effective to induce said variations.
Claim 2
Dependent Claim
76 words
A composition which exhibits fluorescent intensity variations at its solid to mesomorphic or mesomorphic to isotropic phase transition comprising a solution of one or a mixture of liquid crystal compounds of the formula ##SPC7## wherein R is C n H 2n +1 -- or C n H 2n +1 CO-- and n is an integer from 1-10 and an amount of 2, 4, 6-trimethylpyridinium tetrakis [1, 1, 1-trifluoro-4-(p-trifluoromethylphenyl)-2, 4-butenedioxo] europium III effective to induce said variations.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein said liquid crystal compound is p-n-hexacyloxybenzylidene-p'-aminobenzonitrile.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein said liquid crystal compound is p-n-heptacyloxybenzylidene-p'-aminobenzonitrile.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein said liquid crystal compound is p-n-hexoxybenzylidene-p'-aminobenzonitrile.
Claim 6
Dependent Claim
21 words
The composition of claim 1 wherein said mixture of liquid crystal compounds is an equimolar mixture of p-n-hexacyloxybenzlidene-p'-aminobenzonitrile, p-n-heptacyloxybenzylidene-p'-aminobenzonitrile, and p-n-hexoxybenzylidene-p'-aminobenzonitrile.
References Cited (Backward Citations)
US3597044A
Cited
US3663086A
Cited
US3703329A
Cited
US3771065A
Cited
US3864022A
Cited
US3844637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |