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US4877313A
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Light-polarizing materials and suspensions thereof
Assignee: Research Frontiers Inc
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Filing: 1989-02-10
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Granted: 1989-10-31
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Expires: 2009-02-10
Abstract
Abstract Light-polarizing materials, and uses thereof in liquid suspensions, set suspensions and light valves.
Inventors
- 👤 Robert L. Saxe
- 👤 Robert I. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:05
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/08; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/172
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A light-polarizing material containing adsorbed iodine, comprising complex obtained by reacting (i) elemental molecular iodine, (ii) a hydrohalide acid and/or an ammonium or alkali metal or alkaline earth metal halide and (iii) a compound having the formula: ##STR2## wherein R 1 is carboxy, hydroxy, 2-pyridyl or lower alkyl substituted by carboxy or hydroxy; A is alkylene forming with the depicted carbon atom a carbocyclic ring; R 2 is carboxy, hydroxy, or lower alkyl substituted by carboxy or hydroxy; and R 3 and R 4 are independently hydrogen or lower alkyl.
Claim 2
Dependent Claim
90 words
A light-polarizing material containing adsorbed iodine, comprising complex obtained by reacting (i) elemental molecular iodine, (ii) a hydrohalide acid and/or an ammonium or alkali metal or alkaline earth metal halide and (iii) a compound having the formula: ##STR2## wherein R 1 is carboxy, hydroxy, 2-pyridyl or lower alkyl substituted by carboxy or hydroxy; A is alkylene forming with the depicted carbon atom a carbocyclic ring; R 2 is carboxy, hydroxy, or lower alkyl substituted by carboxy or hydroxy; and R 3 and R 4 are independently hydrogen or lower alkyl.
Claim 3
Dependent Claim
30 words
The light-polarizing material according to claim 1, wherein said halide of said hydrohalide acid and/or said ammonium or alkali metal or alkaline earth metal halide is chloride, bromide or iodide.
Claim 4
Dependent Claim
24 words
The light-polarizing material according to claim 1, wherein said compound is picolinic acid, 2-hydroxypyridine, glycine anhydride, barbituric acid, quinaldic acid, 8-hydroxyquinoline, cycloleucine or 2,2'-dipyridyl.
Claim 5
Dependent Claim
45 words
A liquid suspension for a light valve, comprising an electrically resistive liquid suspending medium, a plurality of small, anisometrically shaped particles of the light-polarizing material of claim 1 dispersed therein and at least one dispersing material dissolved therein for dispersing said particles in said suspension.
Claim 6
Dependent Claim
30 words
A liquid suspension according to claim 4, wherein said halide of said hydrohalide acid and/or said ammonium or alkali metal or alkaline earth metal halide is chloride, bromide or iodide.
Claim 7
Dependent Claim
24 words
The liquid suspension according to claim 4, wherein said compound is picolinic acid, 2-hydroxypyridine, glycine anhydride, barbituric acid, quinaldic acid, 8-hydroxyquinoline, cycloleucine or 2,2'-dipyridyl.
Claim 8
Dependent Claim
37 words
A light-polarizing body, comprising a plurality of particles of the light-polarizing material according to claim 1, dispersed in a carrier, the polarizing axis of said particles being oriented and immovably retained by said carrier in substantial parallelism.
Claim 9
Dependent Claim
30 words
The light-polarizing body according to claim 7, wherein said halide of said hydrohalide acid and/or said ammonium or alkali metal or alkaline earth metal halide is chloride, bromide or iodide.
Claim 10
Dependent Claim
23 words
The light-polarizing body according to claim 7, wherein said compound picolinic acid, 2-hydroxypyridine, glycine anhydride, barbituric acid, quinaldic acid, 8-hydroxyquinoline, cycloleucine or 2,w'-dipyridyl.
Claim 11
Dependent Claim
34 words
In a light valve, comprising a cell containing a suspension of light-polarizing particles in a liquid suspending medium, the improvement wherein said light-polarizing particles are particles of the light-polarizing material according to claim 1.
Claim 12
Dependent Claim
30 words
The light valve according to claim 10, wherein said halide of said hydrohalide acid and/or said ammonium or alkali metal or alkaline earth metal halide is chloride, bromide or iodide.
Claim 13
Dependent Claim
24 words
The light valve according to claim 10, wherein said compound is picolinic acid, 2-hydroxypyridine, glycine anhydride, barbituric acid, quinaldic acid, 8-hydroxyquinoline, cycloleucine or 2,2'-dipyridyl.
Claim 14
Dependent Claim
14 words
The light polarizing material according to claim 1, wherein said compound is glycine anhydride.
Claim 15
Dependent Claim
14 words
A liquid suspension according to claim 4, wherein in said compound is glycine anhydride.
Claim 16
Dependent Claim
14 words
A light polarizing body according to claim 7 wherein said compound is glycine anhydride.
Claim 17
Dependent Claim
13 words
The light valve according to claim 10 wherein said compound is glycine anhydride.
References Cited (Backward Citations)
US1951664A
Cited
US2176516A
Cited
US3492299A
Cited
DE2162238A1
Cited
US4164365A
Cited
US4422963A
Cited
US4247175A
Cited
US4270841A
Cited
JPS57118567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |