US4344674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device with improved erasing characteristic
Assignee: Wyeth Holdings LLC
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Filing: 1980-07-18
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Granted: 1982-08-17
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Expires: 2000-07-18
Abstract
Abstract An electrochromic device having an electrochromic layer of persistent electrochromic material such as tungsten oxide, and an electrolyte layer and a counter electrode which comprises an oxidizing agent which has oxidizing electrode potential more negative than the electrochromic layer to provide a stored charge for erasing color from the electrochromic layer, and to increase the emf of the charge used for the erase function. Examples of suitable oxidizing agents are manganese dioxide and chromic oxide.
Inventors
- 👤 Robert D. Giglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:25
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524; G02F1/17
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
An electrochromic device comprising a film of persistant electrochromic inorganic compound, an electrode layer on one side of said film, an electrolyte layer on the opposite side of said film, a conductive counter electrode layer on the opposite side of said electrolyte layer, said counter electrode layer comprising an electrochemically reversible oxidizing agent having oxidizing electrode potential more negative than carbon to increase the open circuit potential of said device when the film of electrochromic material is in its colored state.
Claim 2
Dependent Claim
81 words
An electrochromic device comprising a film of persistant electrochromic inorganic compound, an electrode layer on one side of said film, an electrolyte layer on the opposite side of said film, a conductive counter electrode layer on the opposite side of said electrolyte layer, said counter electrode layer comprising an electrochemically reversible oxidizing agent having oxidizing electrode potential more negative than carbon to increase the open circuit potential of said device when the film of electrochromic material is in its colored state.
Claim 3
Dependent Claim
14 words
An electrochromic device defined by claim 1 wherein said oxidizing agent is manganese dioxide.
Claim 4
Dependent Claim
14 words
An electrochromic device defined by claim 1 wherein said oxidizing agent is chromic oxide.
Claim 5
Dependent Claim
20 words
An electrochromic device defined by claim 1 wherein said counter electrode layer comprises carbon with said oxidizing agent dispersed therein.
Claim 6
Dependent Claim
15 words
An electrochromic device defined by claim 4 wherein the dispersed oxidizing agent is manganese dioxide.
Claim 7
Dependent Claim
15 words
An electrochromic device defined by claim 4 wherein the dispersed oxidizing agent is chromic oxide.
Claim 8
Dependent Claim
18 words
An electrochromic device defined by claim 1 wherein the defined persistent electrochromic inorganic compound is electrochromic tungsten oxide.
Claim 9
Dependent Claim
28 words
An electrochromic device defined by claim 4 wherein the persistent electrochromic layer is electrochromic tungsten oxide and the oxidizing agent in the counter electrode layer is manganese dioxide.
Claim 10
Dependent Claim
28 words
An electrochromic device defined by claim 4 wherein the persistent electrochromic layer is electrochromic tungsten oxide and the oxidizing agent in the counter electrode layer is chromic oxide.
Claim 11
Dependent Claim
19 words
An electrochromic device defined by claim 7 wherein the defined electrolyte layer comprises ion conductive electrically insulating polymeric resin.
Claim 12
Dependent Claim
15 words
An electrochromic device defined by claim 10 wherein the defined oxidizing agent is manganese dioxide.
Claim 13
Dependent Claim
15 words
An electrochromic device defined by claim 10 wherein the defined oxidizing agent is chromic oxide.
References Cited (Backward Citations)
US3978007A
Cited
US4174152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |