US4059341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device with electrolytes and a method of producing the same
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1976-04-02
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Granted: 1977-11-22
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Expires: 1996-04-02
Abstract
Abstract An improved electrochromic display device and a method of making it are disclosed. The display device includes a proton free substance used as the electrolyte which increases the lifetime of the display, even at high switching voltages. The disclosed method includes the initial dehydration of the electrolyte material and the subsequent addition of a drying agent to it.
Inventors
- 👤 Hans-Rudolf Zeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:41
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
In an electrochromic display device having an electrochromic layer present in its solid form upon a first electrode and in contact with a water-free electrolyte contacting a second electrode, the the improvement comprising: a proton-free substance as said electrolyte and an operating voltage between said two electrodes exceeding two volts.
Claim 2
Dependent Claim
50 words
In an electrochromic display device having an electrochromic layer present in its solid form upon a first electrode and in contact with a water-free electrolyte contacting a second electrode, the the improvement comprising: a proton-free substance as said electrolyte and an operating voltage between said two electrodes exceeding two volts.
Claim 3
Dependent Claim
14 words
A display device as in claim 1, wherein: said electrolyte includes a drying medium.
Claim 4
Dependent Claim
22 words
A display device as in claim 1, wherein: said electrolyte is an anhydrous salt solution of at least one hygroscopic alkali salt.
Claim 5
Dependent Claim
36 words
A display device as in claim 3, wherein: said electrolyte contains lithium chloride as an alkali salt, and a solvent from the group consisting of propylene carbonate, dimethyl formamide, dimethyl sulphoxide, butyrolacetone, tetrahydrofuran, acetonitrile and 1,2-dimethoxyethane.
Claim 6
Dependent Claim
36 words
A display device as in claim 3, wherein: said electrolyte contains lithium perchlorate as an alkali salt, and a solvent from the group consisting of propylene carbonate, dimethyl formamide, dimethyl sulphoxide, butyrolacetone, tetrahydrofuran, acetonitrile and 1,2-dimethoxyethane.
Claim 7
Dependent Claim
15 words
A display device as in claim 3, wherein: said salt is dissolved in complex form.
Claim 8
Dependent Claim
21 words
A display device as in claim 3, wherein: said electrolyte includes a complex-forming agent to increase the solubility of said salt.
Claim 9
Dependent Claim
30 words
A display device as in claim 7, wherein: the complex-forming agent is selected from the group consisting of N,N,N',N'-tetramethyl ethylene diamine, aluminium chloride, ethylene diamine tetra acetic acid and kryptates.
Claim 10
Dependent Claim
21 words
A display device as in claim 1, wherein: said electrolyte is a 0.1-1 molar solution of lithium perchlorate in propylene carbonate.
References Cited (Backward Citations)
US3839857A
Cited
US3843232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |