US4187003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte for electrochromic display device
Assignee: International Business Machines Corp
•
Filing: 1978-08-21
•
Granted: 1980-02-05
•
Expires: 1998-08-21
Abstract
Abstract Improved performance is achieved in electrochromic display devices comprising an oxidation-reduction system and an electrolyte wherein the electrolyte comprises hypophosphite anions, phosphite anions, or both.
Inventors
- 👤 Donald J. Barclay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:25
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1503
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
In an electrochromic display device which comprises a display electrode, an anode, and an aqueous electrolyte solution disposed therebetween which produces a display effect by electrodeposition of a colored species from the electrolyte onto the display electrode as a result of a redox reaction, the improvement according to which the electrolyte comprises an anion which is either hypophosphite or phosphite and a cation which has a bipyridinium structure.
Claim 2
Dependent Claim
68 words
In an electrochromic display device which comprises a display electrode, an anode, and an aqueous electrolyte solution disposed therebetween which produces a display effect by electrodeposition of a colored species from the electrolyte onto the display electrode as a result of a redox reaction, the improvement according to which the electrolyte comprises an anion which is either hypophosphite or phosphite and a cation which has a bipyridinium structure.
Claim 3
Dependent Claim
15 words
An electrochromic display device as claimed in claim 1 wherein the electrolyte comprises hypophosphite anions.
Claim 4
Dependent Claim
15 words
An electrochromic display device as claimed in claim 1 wherein the electrolyte comprises phosphite anions.
Claim 5
Dependent Claim
19 words
An electrochromic display device as claimed in claim 1 wherein the electrolyte comprises both hypophosphite anions and phosphite anions.
Claim 6
Dependent Claim
16 words
An electrochromic display device as claimed in claim 1 wherein the electrolyte also includes bromide anions.
Claim 7
Dependent Claim
17 words
An electrochromic display device as claimed in claim 1 wherein the electrolyte also includes dihydrogen phosphate anions.
Claim 8
Dependent Claim
16 words
An electrochromic display device as claimed in claim 1 wherein the electrolyte comprises heptyl viologen cations.
References Cited (Backward Citations)
US3951521A
Cited
US3451741A
Cited
US3774988A
Cited
US3806229A
Cited
US3712709A
Cited
US3854794A
Cited
US3912368A
Cited
US4018508A
Cited
US3950077A
Cited
US3961842A
Cited
US4116535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |