US4432612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalocyanine electrochromic display with improved cycle life
Assignee: Boeing North American Inc
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Filing: 1981-09-16
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Granted: 1984-02-21
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Expires: 2001-09-16
Abstract
Abstract An electrochromic display cell including a pair of enclosure plates, at least one of which is transparent, and a counter electrode and a display electrode disposed between the enclosure plates. A layer of electrochromic material is disposed on the display electrode. A liquid electrolyte material is disposed between the counter electrode and display electrode, the electrolyte material being mildly acidic and having a pH between 2 and 5. The layer of electrochromic material is preferably selected from the group consisting of a diphthalocyanine of a rare-earth element, yttrium and scandium.
Inventors
- 👤 Margie M. Nicholson
- 👤 Frank A. Pizzarello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1516
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states and having a cycle life in excess of 50,000 cycles comprising: a pair of enclosure plates, at least one of which is transparent; a counter electrode and a display electrode disposed between said enclosure plates; a layer of electrochromic material disposed on said display electrode, said layer of electrochromic material consisting of an electrochromic diphthalocyanine compound; and a liquid electrolyte material disposed between said counter electrode and said display electrode, said liquid electrolyte material being specifically selected to be mildly acidic and having a pH between approximately 5 and 2 so as to enable the display cell to function in excess of a 50,000 cycle lifetime, to provide enhanced color contrast, and longer color retention of the red color mode.
Claim 2
Dependent Claim
134 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states and having a cycle life in excess of 50,000 cycles comprising: a pair of enclosure plates, at least one of which is transparent; a counter electrode and a display electrode disposed between said enclosure plates; a layer of electrochromic material disposed on said display electrode, said layer of electrochromic material consisting of an electrochromic diphthalocyanine compound; and a liquid electrolyte material disposed between said counter electrode and said display electrode, said liquid electrolyte material being specifically selected to be mildly acidic and having a pH between approximately 5 and 2 so as to enable the display cell to function in excess of a 50,000 cycle lifetime, to provide enhanced color contrast, and longer color retention of the red color mode.
Claim 3
Dependent Claim
29 words
A display cell as defined in claim 1, wherein said electrochromic diphthalocyanine compound is selected from the group consisting of a diphthalocyanine of a rare-earth element, yttrium, and scandium.
Claim 4
Dependent Claim
22 words
A display cell as defined in claim 1, wherein said electrolyte material comprises a mixture of phthalic acid and potassium acid phthalate.
Claim 5
Dependent Claim
21 words
A display cell as defined in claim 1, wherein said electrolyte material comprises a mixture of acetic acid and sodium acetate.
Claim 6
Dependent Claim
17 words
A display cell as defined in claim 1, wherein said electrolyte material comprises an acidic buffer solution.
Claim 7
Dependent Claim
115 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states and having a cycle life in excess of 50,000 cycles comprising: a counter electrode and a display electrode disposed in said cell; a layer of electrochromic material disposed on said display electrode, said layer of electrochromic material consisting of an electrochromic diphthalocyanine compound; a liquid electrolyte material disposed between said counter electrode and said display electrode, said electrolyte material being mildly acidic and having a pH between approximately 5 and 2 so as to enable the display cell to function in excess of a 50,000 cycle lifetime, to provide enhanced color contrast, and longer color retention of the red color mode.
Claim 8
Dependent Claim
115 words
An electrochromic display cell capable of assuming a plurality of visually distinct optical states and having a cycle life in excess of 50,000 cycles comprising: a counter electrode and a display electrode disposed in said cell; a layer of electrochromic material disposed on said display electrode, said layer of electrochromic material consisting of an electrochromic diphthalocyanine compound; a liquid electrolyte material disposed between said counter electrode and said display electrode, said electrolyte material being mildly acidic and having a pH between approximately 5 and 2 so as to enable the display cell to function in excess of a 50,000 cycle lifetime, to provide enhanced color contrast, and longer color retention of the red color mode.
Claim 9
Dependent Claim
29 words
A display cell as defined in claim 6, wherein said electrochromic diphthalocyanine compound is selected from the group consisting of a diphthalocyanine of a rare-earth element, yttrium, and scandium.
Claim 10
Dependent Claim
22 words
A display cell as defined in claim 6, wherein said electrolyte material comprises a mixture of phthalic acid and potassium acid phthalate.
Claim 11
Dependent Claim
21 words
A display cell as defined in claim 6, wherein said electrolyte material comprises a mixture of acetic acid and sodium acetate.
Claim 12
Dependent Claim
17 words
A display cell as defined in claim 6, wherein said electrolyte material comprises an acidic buffer 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) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |