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Patent US3795436A successfully refreshed from Google Patents.
US3795436A
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US
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Nematogenic material which exhibit the kerr effect at isotropic temperatures
Assignee: F Hoffmann La Roche AG
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Filing: 1972-07-11
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Granted: 1974-03-05
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Expires: 1992-07-11
Abstract
Abstract WHEREIN R is n-butyl, n-pentyl, n-hexyl, N-HEPTYL OR N-OCTYL, OR MIXTURES THEREOF OR MIXTURES OF THESE COMPOUNDS WITH OTHER NEMATOGENIC SUBSTANCES. WHEREIN R is ethyl, n-propyl, n-butyl, n-pentyl, N-HEXYL, ISOHEXYL, N-HEPTYL OR N-OCTYL OR COMPOUNDS OF THE GENERAL FORMULA An electro-optical light-modulation cell having a dielectric disposed between electrodes and being comprised of a nematogenic fluid in the isotropic state, is described. Said dielectric, upon application of a voltage to the electrodes, becomes double refracting. More particularly the nematogenic fluid comprises compounds of the general formula
Inventors
- 👤 A Boller
- 👤 H Scherrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:42
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/07
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
30 words
A cell in accordance with claim 1, wherein the nematogenic fluid is at a temperature near the temperature Tc of the phase change between the isotropic and the anisotropic state.
Claim 2
Dependent Claim
25 words
A cell in accordance with claim 2, wherein the temperature t of the nematogenic fluid is in the range Tc <t < or = tc+1*c.
Claim 3
Dependent Claim
25 words
A cell in accordance with claim 3, wherein the dielectric comprises a mixture of p((p-n-hexylbenzylidene)amino)-benzonitrile and p-((p-n-butylbenzylidene)-amino)benzonitrile in a molar ratio of 2:1 to 1:2.
Claim 4
Dependent Claim
23 words
A cell in accordance with claim 3, wherein the dielectric comprises a mixture of p-((p-n-propylbenzylidene)-amino)-benzonitrile and p-((p-n-hexylbenzylidene)amino)benzonitrile in a molar ratio of 1:2.
Claim 5
Dependent Claim
23 words
A cell in accordance with claim 3, wherein the dielectric comprises a mixture of p-((p-n-heptylbenzylidene)-amino)-benzonitrile and p-((p-n-butylbenzylidene)amino)benzonitrile in a molar ratio of 2:1.
Claim 6
Dependent Claim
23 words
A cell in accordance with claim 3, wherein the dielectric comprises a mixture of p-((p-n-octylbenzylidene)amino)-benzonitrile and p-((p-n-pentylbenzylidene)amino)-benzonitrile in a molar ratio of 2:1.
Claim 7
Dependent Claim
44 words
A cell in accordance with claim 3, which comprises polarizers for continuously modulating light transmitted through the cell, one polarizer being disposed upstream of the cell and the other being disposed downstream of the cell in the direction of light traveling through the cell.
Claim 8
Dependent Claim
13 words
A cell in accordance with claim 8 wherein the two polarizers are crossed.
Claim 9
Dependent Claim
44 words
In an electro-optical light-modulation cell having a dielectric which is disposed between electrodes and which becomes doubly refracting on application of a voltage to the electrodes, the improvement which comprises a dielectric in the isotropic state comprised of a compound characterized by the formula:
Claim 10
Dependent Claim
30 words
A cell in accordance with claim 10, wherein the nematogenic fluid is at a temperature near the temperature Tc of the phase change between the isotropic and the anisotropic state.
Claim 11
Dependent Claim
25 words
A cell in accordance with claim 11, wherein the temperature t of the nematogenic fluid is in the range Tc <t < or = tc+1*c.
Claim 12
Dependent Claim
31 words
A cell in accordance with claim 12, wherein the dielectric comprises a mixture of p-n-heptylbenzoic acid-p''-cyanophenyl ester and p-n-butylbenzoic acid-p''-cyanophenyl ester or p-n-pentylbenzoic acid-p''-cyanophenyl ester in a molar ratio of 2:1.
Claim 13
Dependent Claim
31 words
A cell in accordance with claim 12, wherein the dielectric comprises a mixture of p-n-octylbenzoic acid-p''-cyanophenyl ester and p-n-butylbenzoic acid-p''-cyanophenyl ester or p-n-hexylbenzoic acid-p''-cyanophenyl ester in a molar ratio of 2:1.
Claim 14
Dependent Claim
27 words
A cell in accordance with claim 12, wherein the dielectric comprises a mixture of p-n-hexylbenzoic acid-p''-cyanophenyl ester and p-n-butylbenzoic acid-p''-cyanophenyl ester in a molar ratio of 2:1.
Claim 15
Dependent Claim
44 words
A cell in accordance with claim 12, which comprises polarizers for continuously modulating light transmitted through the cell, one polarizer being disposed upstream of the cell and the other being disposed downstream of the cell in the direction of light traveling through the cell.
Claim 16
Dependent Claim
13 words
A cell in accordance with claim 16 wherein the two polarizers are crossed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |