Patent US4375318A successfully refreshed from Google Patents.
US4375318A
Expired / Lapsed
US
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Electrochromic cells with improved electrolyte system
Assignee: Wyeth Holdings LLC
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Filing: 1980-07-30
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Granted: 1983-03-01
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Expires: 2000-07-30
Abstract
Abstract Electrochromic devices are described having a layer of electrochromic material, e.g. WO 3 , in contact with a layer of organic electrolyte resin, with electrode means for changing electrochromic properties of the device by electric field means. The electrolyte resin layer comprises a hydrophilic layer of homopolymer of poly(2-acrylamido-2-methylpropanesulfonic acid) with an organic humectant and in some preferred embodiments may further comprise a thinner layer of less hydrophilic electrolyte resin between the homopolymer and electrochromic layers.
Inventors
- 👤 Robert D. Giglia
- 👤 Sun Y. Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:50
CPC Classifications
C; C25; C25B; C25B11/00; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525; H; H01; H01M; H01M14/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
In an electrochromic device comprising a polymeric current-carrier-permeable layer in ion-conductive contact with a layer of persistent electrochromic inorganic oxide with both of said layers disposed between electrode layers and means for alternately applying electric fields of opposite polarity across said electrodes for changing the coloration in said electrochromic layer, the improvement wherein said current-carrier-permeable layer comprises a layer of polymeric electrolyte consisting of poly(2-acrylamido-2-methylpropanesulfonic acid) homopolymer and with an added organic humectant.
Claim 2
Dependent Claim
73 words
In an electrochromic device comprising a polymeric current-carrier-permeable layer in ion-conductive contact with a layer of persistent electrochromic inorganic oxide with both of said layers disposed between electrode layers and means for alternately applying electric fields of opposite polarity across said electrodes for changing the coloration in said electrochromic layer, the improvement wherein said current-carrier-permeable layer comprises a layer of polymeric electrolyte consisting of poly(2-acrylamido-2-methylpropanesulfonic acid) homopolymer and with an added organic humectant.
Claim 3
Dependent Claim
14 words
An improved device defined by claim 1 wherein the organic humectant is polyethylene glycol.
Claim 4
Dependent Claim
14 words
An improved device defined by claim 1 wherein the organic humectant is polyethylene oxide.
Claim 5
Dependent Claim
20 words
An improved device defined by claim 1 wherein the organic humectant is polyethylene oxide having a molecular weight of 100,000.
Claim 6
Dependent Claim
20 words
An improved device defined by claim 1 wherein the organic humectant is polyethylene oxide having a molecular weight of 900,000.
References Cited (Backward Citations)
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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) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |