US4116545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric electrolyte for electrochromic display devices
Assignee: Wyeth Holdings LLC
•
Filing: 1976-10-27
•
Granted: 1978-09-26
•
Expires: 1996-10-27
Abstract
Abstract Disclosed is an electrochromic variable light modulating device including an improved ion conducting layer. The ion conductor comprises a polymeric composition containing polyethylene sulfonic acid, a pigment and water.
Inventors
- 👤 Thomas Bradley Reddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:30
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
In an electrochromic variable light modulating device having an arrangement comprising a light transmitting substrate with a persistent electrochromic material as a light modulator and a counter-electrode separated from said substrate by an ion conducting material, an improved ion conducting material comprising an aqueous solution of polyethylene sulfonic acid which has been dehydrated to viscoelastic consistency.
Claim 2
Dependent Claim
56 words
In an electrochromic variable light modulating device having an arrangement comprising a light transmitting substrate with a persistent electrochromic material as a light modulator and a counter-electrode separated from said substrate by an ion conducting material, an improved ion conducting material comprising an aqueous solution of polyethylene sulfonic acid which has been dehydrated to viscoelastic consistency.
Claim 3
Dependent Claim
15 words
The electrochromic device of claim 1 wherein the ion conducting material further includes a pigment.
Claim 4
Dependent Claim
18 words
The electrochromic device of claim 2 wherein the ion conducting material further comprises a low molecular weight acid.
References Cited (Backward Citations)
US2527300A
Cited
US2898311A
Cited
US3320218A
Cited
US3510418A
Cited
US3453038A
Cited
US3546142A
Cited
US3629082A
Cited
US3708220A
Cited
US3704057A
Cited
US3819252A
Cited
US3840288A
Cited
US3892472A
Cited
US3970365A
Cited
US3957352A
Cited
DE2603200A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |