US5002701A
Expired / Lapsed
US
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Light polarizing materials and suspensions thereof
Assignee: Research Frontiers Inc
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Filing: 1989-10-27
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Granted: 1991-03-26
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Expires: 2009-10-27
Abstract
Abstract Light-polarizing materials comprising a complex obtained by reacting elemental iodine, and iodide and a monoalkyl- or dialkyl-piperazinedione or an unsubstituted or monoalkyl- or dialkyl- substituted 2,5-dicarboxy-pyrazine, and uses thereof in liquid suspensions, set suspensions and light valves.
Inventors
- 👤 Robert L. Saxe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:22
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; 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
50 words
A light-polarizing material containing adsorbed iodine, comprising a complex obtained by reacting (i) elemental iodine, (ii) a hydrohalide acid or an ammonium or alkali metal or alkaline earth metal halide and (iii) a compound having the formula: ##STR2## wherein R 3 and R 4 are independently hydrogen or lower alkyl.
Claim 2
Dependent Claim
50 words
A light-polarizing material containing adsorbed iodine, comprising a complex obtained by reacting (i) elemental iodine, (ii) a hydrohalide acid or an ammonium or alkali metal or alkaline earth metal halide and (iii) a compound having the formula: ##STR2## wherein 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
15 words
The light-polarizing material according to claim 1, wherein said compound is 2,5-dicarboxy-pyrazine or 3,6-dimethylpyrazine-2,5-dicarboxylic acid.
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
15 words
The liquid suspension according to claim 4, wherein said compound is 2,5-dicarboxy-pyrazine or 3,6-dimethyl-pyrazine-2,5-dicarboxylic acid.
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
15 words
The light-polarizing polyhalide according to claim 7, wherein said compound is 2,5-dicarboxy-pyrazine or 3,6-dimethylpyrazine-2,5-dicarboxylic acid.
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
15 words
The light valve according to claim 10, wherein said compound is 2,5-dicarboxy-pyrazine or 3,6-dimethyl-pyrazine-2,5-dicarboxylic acid.
Claim 14
Dependent Claim
12 words
The light-polarizing material according to claim 1, wherein said compound is 2,5-dicarboxy-pyrazine.
Claim 15
Dependent Claim
12 words
The liquid suspension according to claim 4, wherein said compound is 2,5-dicarboxy-pyrazine.
Claim 16
Dependent Claim
12 words
The light-polarizing body according to claim 7, wherein said compound is 2,5-dicarboxy-pyrazine.
Claim 17
Dependent Claim
12 words
The light valve according to claim 10, wherein said compound is 2,5-dicarboxy-pyrazine.
References Cited (Backward Citations)
US4877313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |