Patent US4361385A successfully refreshed from Google Patents.
US4361385A
Expired / Lapsed
US
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Electrochromic device containing acid copolymer electrolyte
Assignee: Wyeth Holdings LLC
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Filing: 1980-10-23
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Granted: 1982-11-30
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Expires: 2000-10-23
Abstract
Abstract In electrochromic devices having a layer of electrochromic material, e.g. tungsten oxide, in contact with a polymeric electrolyte layer, the stability and speed of the device are improved by using a copolymer of 2-acrylamido-2-methylpropanesulfonic acid and vinyl sulfonic acid as the polymeric electrolyte.
Inventors
- 👤 Sun Y. Huang
- 👤 Robert D. Giglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:43
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
49 words
In an electrochromic device comprising a film of persistent electrochromic material in ion-conductive contact with a polymeric electrolytic film, and with both of said layers between two electrode layers of opposite polarity, the improvement wherein said polymeric electrolyte film is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid and vinyl sulfonic acid.
Claim 2
Dependent Claim
49 words
In an electrochromic device comprising a film of persistent electrochromic material in ion-conductive contact with a polymeric electrolytic film, and with both of said layers between two electrode layers of opposite polarity, the improvement wherein said polymeric electrolyte film is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid and vinyl sulfonic acid.
Claim 3
Dependent Claim
15 words
An improved device defined by claim 1 wherein the persistent electrochromic material is tungsten oxide.
Claim 4
Dependent Claim
25 words
An improved device defined by claim 1 wherein the ratio of copolymerized 2-acrylamido-2-methylpropanesulfonic acid units to vinyl sulfonic acid units in the copolymer is 1:1.
Claim 5
Dependent Claim
31 words
An improved device defined by claim 2 wherein the proportion of copolymerized 2-acrylamido-2-methylpropanesulfonic acid units to vinyl sulfonic acid units in the copolymer is in the range from 3:2 to 2:3.
Claim 6
Dependent Claim
31 words
An improved device defined by claim 2 wherein the proportion of copolymerized 2-acrylamido-2-methylpropanesulfonic acid units to vinyl sulfonic acid units in the copolymer is in the range from 0.01:1 to 10:1.
References Cited (Backward Citations)
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Cited
US4175838A
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US4116545A
Cited
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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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |