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US4248503A
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Electrochromic display device
Assignee: ETS SA A SWISS CORP
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Filing: 1978-11-06
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Granted: 1981-02-03
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Expires: 1998-11-06
Abstract
Abstract Display elements of an electrochromic display device are formed of two lines of electrochromic material separated by a zone devoid of such material. The areas of the lines of every element are equal to produce equal contrast effects in response to equal activation charges applied thereto.
Inventors
- 👤 Freddy Huguenin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:54
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/302; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
In an electrochromic display device having display elements wherein the improvement comprises each element being formed by two lines of electrochromic material separated by a zone which is devoid of said material, the area of the electrochromic material being the same for all the elements.
Claim 2
Dependent Claim
45 words
In an electrochromic display device having display elements wherein the improvement comprises each element being formed by two lines of electrochromic material separated by a zone which is devoid of said material, the area of the electrochromic material being the same for all the elements.
Claim 3
Dependent Claim
28 words
The electrochromic display device as claimed in claim 1 wherein the width of the lines of each of the elements is constant and inversely proportional to their length.
Claim 4
Dependent Claim
38 words
The electrochromic display device as claimed in claim 2 wherein the two lines of each of the elements are parallel and the distance separating the outer longitudinal edges of said lines is the same for all the elements.
References Cited (Backward Citations)
US4160241A
Cited
US4153344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |