US4073570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1976-03-15
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Granted: 1978-02-14
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Expires: 1996-03-15
Abstract
Abstract An electrochromic device in which the electrochromic medium contains a low concentration of an auxiliary redox system and a relatively large concentration of an inert electrolyte.
Inventors
- 👤 Karel A. Korinek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:22
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1503
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
An electrochromic device comprising a working electrode having radiation reflection or transmission properties, a counter electrode, and an electrochromic medium contacting the working and counter electrodes, the medium comprising an electrochromically active material, an auxiliary redox system present in a concentration from 1 × 10 -5 to 5 × 10 -2 M and an inert electrolyte.
Claim 2
Dependent Claim
56 words
An electrochromic device comprising a working electrode having radiation reflection or transmission properties, a counter electrode, and an electrochromic medium contacting the working and counter electrodes, the medium comprising an electrochromically active material, an auxiliary redox system present in a concentration from 1 × 10 -5 to 5 × 10 -2 M and an inert electrolyte.
Claim 3
Dependent Claim
38 words
A device according to claim 1 in which the concentration of the inert electrolyte is sufficient to raise the electrical conductivity of the medium to that of an equivalent medium containing ferrous ammonium sulphate in 0.1 M concentration.
Claim 4
Dependent Claim
27 words
A device according to claim 1 in which the electrochromically active material is an N-substituted derivative of an organic compound having at least two nitrogen containing rings.
Claim 5
Dependent Claim
29 words
A device according to claim 1 in which the concentration of the auxiliary redox system is within the range 1 × 10 -3 to 1 × 10 -2 M.
Claim 6
Dependent Claim
19 words
A device according to claim 1 in which the auxiliary redox system is Fe ++ ⃡ Fe +++ .
Claim 7
Dependent Claim
15 words
A device according to claim 5 in which the electrochromic medium contains ferrous ammonium sulphate.
Claim 8
Dependent Claim
23 words
A device according to claim 1 in which the inert electrolyte is present in a concentration with the range 0.1 M to saturation.
Claim 9
Dependent Claim
24 words
A device according to claim 1 in which the electrochromic medium contains a complexing agent for the metal ion of the auxiliary redox system.
Claim 10
Dependent Claim
17 words
A device according to claim 8 in which the complexing agent is a saturated hydroxy carboxylic acid.
Claim 11
Dependent Claim
56 words
An electrochromic medium comprising an electrochromically active material, an auxiliary redox system present in a concentration from 1 × 10 -5 to 5 × 10 -2 M and an inert electrolyte in concentration sufficient to raise the electrical conductivity of the medium to that of an equivalent medium containing ferrous ammonium sulphate in 0.1 M concentration.
Claim 12
Dependent Claim
56 words
An electrochromic medium comprising an electrochromically active material, an auxiliary redox system present in a concentration from 1 × 10 -5 to 5 × 10 -2 M and an inert electrolyte in concentration sufficient to raise the electrical conductivity of the medium to that of an equivalent medium containing ferrous ammonium sulphate in 0.1 M concentration.
References Cited (Backward Citations)
DE2412535A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |