Patent EP0485224A2 successfully refreshed from Google Patents.
EP0485224A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyether-containing electrochemichromic solutions
Assignee: Magna Donnelly Corp
•
Filing: 1991-11-07
•
Granted: —
•
Expires: 2011-11-07
Abstract
Abstract Electrochemichromic solutions and devices are disclosed which have 0.5 percent by volume of at least one polyether which is soluble in the electrochemichromic solution to reduce segregation without unduly affecting leakage current.
Inventors
- 👤 Desaraju Venkatapanduranga Varaprasad
- 👤 Niall Richard Lynam
- 👤 Hamid Reza Habibi
- 👤 Padma Desaraju
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 15:06
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1503; G02F2001/1502; G02F1/1514; G02F2001/15145
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
An electrochemichromic solution comprising a solvent, a redox chemical pair whose colour can be varied by a variation of an applied voltage (if any) and a polyether.
Claim 2
Dependent Claim
54 words
A solution according to claim 1 comprising a redox chemical pair in solution in the solvent which colours in the presence of an applied voltage and which bleaches to a colourless condition in the absence of an applied voltage, the solvent being thickened by addition of an effective amount of at least one polyether.
Claim 3
Dependent Claim
24 words
A solution according to claim 1 or 2 wherein the polyether has a molecular weight of from 100,000 to 6,000,000 such as to 4,000,000.
Claim 4
Dependent Claim
26 words
A solution according to any of claims 1 to 3 in which the viscosity of the electrochemichromic solution is not greater than 600 centistokes at 25°C.
Claim 5
Dependent Claim
29 words
A solution according to any of claims 1 to 4 in which the polyether comprises polyethylene oxide and/or hydroxypropylcellulose suitably at from 0.5 to 10 percent weight by volume.
Claim 6
Dependent Claim
27 words
A solution according to any of claims 1 to 5 in which the solvent comprises 3-hydroxypropionitrile, 2-acetylbutyrolactone, glutaronitrile, 3,3′-oxydipropio-nitrile, 3-methylsulpholane, 2-methylglutaronitrile, propylene carbonate and/or a mixture thereof.
Claim 7
Dependent Claim
39 words
A solution according to any of claims 1 to 6 in which the redox chemical pair comprises of from 0.025 to 0.05 molar of methylviologen (suitably perchlorate) and/or ethylviologen (suitably hexafluorophosphate) and of from 0.025 to 0.05 molar 5,10-dihydro-5,10-dimethylphenazine.
Claim 8
Dependent Claim
48 words
An electrochemichromic cell comprising at least two spaced apart substrates each having an inwardly facing conductive surface and an electrochemichromic solution locating therebetween, the solution comprising a solvent, a redox chemical pair whose colour can be varied by variation of an applied voltage (if any) and a polyether.
Claim 9
Dependent Claim
21 words
An electrochemichromic cell according to claim 8 wherein the electrochemichromic solution is as claimed in any of claims 1 to 7.
Claim 10
Dependent Claim
24 words
An electrochemichromic cell according to claim 8 or 9 wherein the polyether has a molecular weight in the range of from 100,000 to 6,000,000.
Claim 11
Independent Claim
78 words
A method of reducing segregation without unduly affecting leakage current in an electrochemichromic solution which comprises a solvent, a redox chemical pair in solution in the solvent which colours in the present of an applied voltage and which bleaches to a colourless condition in the absence of an applied voltage, the method comprising introducing into the solvent at least one polyether, such as having a molecular weight of from 100,000 to 4,000,000, which is soluble in the solvent.
Claim 12
Independent Claim
54 words
A method of manufacturing an electrochemichromic cell, the method comprising providing at least two spaced apart substrates each having an inwardly facing conductive surface and locating therebetween an electrochemichromic solution which comprises a solvent, a redox chemical pair whose colour can be varied by variation of an applied voltage (if any) and a polyether.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.