Patent US4247175A successfully refreshed from Google Patents.
US4247175A
Expired / Lapsed
US
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Light valve containing improved light valve suspension
Assignee: Research Frontiers Inc
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Filing: 1978-10-31
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Granted: 1981-01-27
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Expires: 1998-10-31
Abstract
Abstract In a light valve comprising a liquid suspension of small particles selected from the group consisting of halogenated alkaloid acid salts and metal halides in a liquid suspending medium, the improvement in which said liquid suspending medium comprises a liquid, saturated, aliphatic halogenated hydrocarbon having a ratio of halogen atoms to all other atoms therein of greater than 1:1, the halogen atoms of said particles being iodine and/or bromine and the halogen atoms of said halogenated hydrocarbon being of lower atomic weight than the halogen atoms of said particles, and at least 50% the halogen atoms of said halogenated hydrocarbon being selected from the group consisting of fluorine and chlorine.
Inventors
- 👤 Robert L. Saxe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:17
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/172
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
A light valve which comprises a cell, a liquid suspension of small particles selected from the group consisting of halogenated alkaloid acid salts and metal halides in a liquid suspending medium in said cell, a polymeric stabilizer dissolved in said liquid suspending medium to prevent agglomeration of said particles, and means for applying an electric field through said suspension, said liquid suspending medium comprising a liquid, saturated, aliphatic halogenated hydrocarbon having a ratio of halogen atoms to all other atoms therein of greater than 1:1, the halogen atoms of said particles being iodine and/or bromine and the halogen atoms of said halogented hydrocarbon being of lower atomic weight than the halogen atoms of said particles, and at least 50% the halogen atoms of said halogenated hydrocarbon being selected from the group consisting of fluorine and chlorine.
Claim 2
Dependent Claim
136 words
A light valve which comprises a cell, a liquid suspension of small particles selected from the group consisting of halogenated alkaloid acid salts and metal halides in a liquid suspending medium in said cell, a polymeric stabilizer dissolved in said liquid suspending medium to prevent agglomeration of said particles, and means for applying an electric field through said suspension, said liquid suspending medium comprising a liquid, saturated, aliphatic halogenated hydrocarbon having a ratio of halogen atoms to all other atoms therein of greater than 1:1, the halogen atoms of said particles being iodine and/or bromine and the halogen atoms of said halogented hydrocarbon being of lower atomic weight than the halogen atoms of said particles, and at least 50% the halogen atoms of said halogenated hydrocarbon being selected from the group consisting of fluorine and chlorine.
Claim 3
Dependent Claim
23 words
The light valve according to claim 1, wherein at least 60% of all the atoms of the halogenated aliphatic hydrocarbon are halogen atoms.
Claim 4
Dependent Claim
22 words
The light valve according to claim 1, wherein said halogenated aliphatic hydrocarbon has at least two halogen atoms for each non-halogen atom.
Claim 5
Dependent Claim
26 words
The light valve according to claim 1, wherein said halogenated aliphatic hydrocarbon is selected from the group consisting of chloroform, carbon tetrachloride, dibromotetrafluoroethane, sym-tetrachlorodifluoroethane and polychlorotrifluoroethylene.
Claim 6
Dependent Claim
16 words
The light valve according to claim 1, wherein said halogenated alkaloid acid salt is light polarizing.
Claim 7
Dependent Claim
25 words
The light valve according to claim 5, wherein said alkaloid is selected from the group consisting of pyridine, picoline, diphenyl oxazole, quinoline, quinaldine, and toluidine.
Claim 8
Dependent Claim
16 words
The light valve according to claim 5, wherein said alkaloid is a heterocyclic organic nitrogen base.
Claim 9
Dependent Claim
14 words
The light valve according to claim 7, wherein said alkaloid is a quinine alkaloid.
Claim 10
Dependent Claim
23 words
The light valve according to claim 8, wherein said quinine alkaloid is selected from the group consisting of quinine, cinchonidine, hydrocinchonidine, and hydrocinchonine.
Claim 11
Dependent Claim
30 words
The light valve according to claim 5, wherein said halogenated alkaloid acid salt is quinine bisulfate ammonium iodide periodide, quinine bisulfate rubidium iodide periodide, or quinine bisulfate cesium iodide periodide.
Claim 12
Dependent Claim
37 words
The light valve according to claim 1, wherein the amount of said halogenated aliphatic hydrocarbon is 1 to 50 percent by weight of said liquid suspending medium, based on the total weight of the liquid suspending medium.
Claim 13
Dependent Claim
22 words
The light valve according to claim 11, wherein the amount of said halogenated aliphatic hydrocarbon is 4 to 50 percent by weight.
Claim 14
Dependent Claim
19 words
The light valve according to claim 1, wherein the liquid suspending medium consists essentially of said halogenated aliphatic hydrocarbon.
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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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |