Patent US4006969A successfully refreshed from Google Patents.
US4006969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-chromic display device
Assignee: Suwa Seikosha KK
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Filing: 1975-12-08
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Granted: 1977-02-08
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Expires: 1995-12-08
Abstract
Abstract In an electro-chromic display device having a display field, provision is made for showing a plurality of indicia in the same or overlapping regions, thereby increasing the range of indicia which can be displayed in a given area.
Inventors
- 👤 Akihiko Kouchi
- 👤 Kunihiro Inoue
- 👤 Hiroshi Takeshita
- 👤 Kuniharu Yamada
- 👤 Tsutomu Otake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:40
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155; G04; G04G; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0035
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An electro-chromic display device, comprising first and second opposed plates, at least said first plate being transparent, electrodes in the form of indicia on the inner surface of each of said opposed plate, the electrode on at least said first plate being transparent, a transparent electrolyte disposed between said plates, a common electrode, an electro-chromic material making contact with said indicia on each of said plates and said common electrode, said common electrode and said indicia on each plate being selectively connectable to an external source of voltage in a selected polarization direction, said common electrode and said indicia forming electrodes being so positioned in non-registry with each other for selectively actuating the indicia on either plate for display so that two sets of indicia may be available in the space normally available for only one set.
Claim 2
Dependent Claim
137 words
An electro-chromic display device, comprising first and second opposed plates, at least said first plate being transparent, electrodes in the form of indicia on the inner surface of each of said opposed plate, the electrode on at least said first plate being transparent, a transparent electrolyte disposed between said plates, a common electrode, an electro-chromic material making contact with said indicia on each of said plates and said common electrode, said common electrode and said indicia on each plate being selectively connectable to an external source of voltage in a selected polarization direction, said common electrode and said indicia forming electrodes being so positioned in non-registry with each other for selectively actuating the indicia on either plate for display so that two sets of indicia may be available in the space normally available for only one set.
Claim 3
Dependent Claim
19 words
The device as claimed in claim 1, wherein said electrolyte is aqueous and said electro-chromic material is viologen bromide.
Claim 4
Dependent Claim
20 words
The device as claimed in claim 1, wherein said electrolyte is an acid and said electro-chromic material is tungsten oxide.
Claim 5
Dependent Claim
23 words
The device as claimed in claim 1, wherein said common electrode is of a member of the group consisting of lead and carbon.
Claim 6
Dependent Claim
32 words
The device as claimed in claim 1, wherein said display device includes a common electrode on each plate, each common electrode being actuated in conjunction with the indicia on the same plate.
Claim 7
Dependent Claim
20 words
The device as claimed in claim 5, wherein each common electrode is disposed outside the display area of said device.
Claim 8
Dependent Claim
15 words
The device as claimed in claim 1, wherein said second plate is of a ceramic.
Claim 9
Dependent Claim
17 words
The device as claimed in claim 7, wherein said indicia on said ceramic plate are of gold.
Claim 10
Dependent Claim
26 words
The device as claimed in claim 1, wherein said indicia are of a member selected from the group consisting of SnO 2 and InO 2 .
Claim 11
Dependent Claim
13 words
The device as claimed in claim 1, wherein said second plate is colored.
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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |