Patent US4699471A successfully refreshed from Google Patents.
US4699471A
Expired / Lapsed
US
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Electrochromic display device
Assignee: Ricoh Co Ltd
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Filing: 1985-06-04
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Granted: 1987-10-13
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Expires: 2005-06-04
Abstract
Abstract An electrochromic light transmission control device in which the electrochromic film is operated under control not to reach the color saturation condition, thereby preventing the occurrence of separation of the film and thus ensuring a long-term service life.
Inventors
- 👤 Kiyoshi Miyake
- 👤 Hiroko Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:45
CPC Classifications
C; C09; C09K; C09K9/00; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
An electrochromic device for controlling light transmission therethrough comprising: a first electrode, an electrochromic film having a first surface in contact with said first electrode and a second surface, an electrolyte provided in contact with said second surface of said electrochromic film, and a second electrode in contact with said electrolyte, and means for applying a predetermined voltage between said first and second electrodes such that said electrochromic film is operated in an unsaturated condition and an electric field is produced across said electrochromic film to vary the rate of transmission of light therethrough.
Claim 2
Dependent Claim
94 words
An electrochromic device for controlling light transmission therethrough comprising: a first electrode, an electrochromic film having a first surface in contact with said first electrode and a second surface, an electrolyte provided in contact with said second surface of said electrochromic film, and a second electrode in contact with said electrolyte, and means for applying a predetermined voltage between said first and second electrodes such that said electrochromic film is operated in an unsaturated condition and an electric field is produced across said electrochromic film to vary the rate of transmission of light therethrough.
Claim 3
Dependent Claim
21 words
The device of claim 1 wherein said electrochromic film is a WO 3 -sputtered film formed by a DC sputtering process.
Claim 4
Dependent Claim
21 words
The device of claim 1 wherein said electrochromic film is a WO 3 -sputtered film formed by a high-frequency sputtering process.
References Cited (Backward Citations)
US4258984A
Cited
US4416516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |