US4371236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display using rare-earth diphthalocyanines and a low freezing-point electrolyte
Assignee: Boeing North American Inc
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Filing: 1981-05-29
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Granted: 1983-02-01
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Expires: 2001-05-29
Abstract
Abstract An electrochromic display utilizing a rare-earth diphthalocyanine complex as the electrochromic material and a low-freezing-point aqueous solution of a metal chloride as the electrolyte is disclosed. Displayed information can be switched in less than 50 milliseconds. The display has multicolor and color reversal capabilities even at very low temperatures.
Inventors
- 👤 Margie M. Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:47
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/1533; G02F1/1514; G02F1/1516; G02F1/1523; G02F1/1525; G02F1/155
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response times less than 50 milliseconds comprising: transparent electronically conductive display electrode means; counterelectrode means for establishing a potential difference relative to said display electrode means; a layer of electrochromic material comprising a rare earth diphthalocyanine complex disposed on said display electrode means; and an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current; wherein said electrolyte material is a concentrated aqueous solution of metal salt which solution freezes at a temperature below approximately -50 C.
Claim 2
Dependent Claim
107 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response times less than 50 milliseconds comprising: transparent electronically conductive display electrode means; counterelectrode means for establishing a potential difference relative to said display electrode means; a layer of electrochromic material comprising a rare earth diphthalocyanine complex disposed on said display electrode means; and an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current; wherein said electrolyte material is a concentrated aqueous solution of metal salt which solution freezes at a temperature below approximately -50 C.
Claim 3
Dependent Claim
30 words
The display cell recited in claim 1, wherein: said rare earth diphthalocyanine complex is selected from the group consisting of rare earth elements in the lanthanide series, yttrium, and scandium.
Claim 4
Dependent Claim
17 words
The display cell recited in claim 1, wherein: said electrolyte material comprises an aqueous calcium chloride solution.
Claim 5
Dependent Claim
19 words
The display cell recited in claim 3 wherein: said calcium chloride represent about 30% by weight of said solution.
Claim 6
Dependent Claim
17 words
The display cell recited in claim 1 wherein: said electrolyte material comprises an aqueous lithium chloride solution.
Claim 7
Dependent Claim
19 words
The display cell recited in claim 5, wherein: said lithium chloride represents about 25% by weight of said solution.
Claim 8
Dependent Claim
106 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response time of less than 50 milliseconds comprising: transparent electronically conductive display electrode means; counterelectrode means for establishing a potential difference relative to said display electrode means; a layer of electrochromic material comprising a rare-earth diphthalocyanine complex disposed on said display electrode means; and an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current; wherein said electrolyte material is a concentrated aqueous solution of calcium chloride which solution freezes at a temperature below -15° C.
Claim 9
Dependent Claim
106 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response time of less than 50 milliseconds comprising: transparent electronically conductive display electrode means; counterelectrode means for establishing a potential difference relative to said display electrode means; a layer of electrochromic material comprising a rare-earth diphthalocyanine complex disposed on said display electrode means; and an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current; wherein said electrolyte material is a concentrated aqueous solution of calcium chloride which solution freezes at a temperature below -15° C.
Claim 10
Dependent Claim
19 words
The display cell recited in claim 7 wherein: said calcium chloride represents about 30% by weight of said solution.
Claim 11
Dependent Claim
106 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response time of less than 50 milliseconds comprising: transparent electronically conductive display electrode means; counterelectrode means for establishing a potential difference relative to said display electrode means; a layer of electrochromic material comprising a rare-earth diphthalocyanine complex disposed on said display electrode means; and an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current; wherein said electrolyte material is a concentrated aqueous solution of lithium chloride which solution freezes at a temperature below -15° C.
Claim 12
Dependent Claim
106 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response time of less than 50 milliseconds comprising: transparent electronically conductive display electrode means; counterelectrode means for establishing a potential difference relative to said display electrode means; a layer of electrochromic material comprising a rare-earth diphthalocyanine complex disposed on said display electrode means; and an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current; wherein said electrolyte material is a concentrated aqueous solution of lithium chloride which solution freezes at a temperature below -15° C.
Claim 13
Dependent Claim
19 words
The display cell recited in claim 9 wherein: said lithium chloride represents about 25% by weight of said solution.
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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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |