US4455506A
Expired / Lapsed
US
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Contrast enhanced electroluminescent device
Assignee: Osram Sylvania Inc
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Filing: 1981-05-11
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Granted: 1984-06-19
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Expires: 2001-05-11
Abstract
Abstract A contrast enhanced electroluminescent device employs a chromium oxide-chromium cermet as the contrast enhancing material.
Inventors
- 👤 Murthy S. Ayyagari
- 👤 Martin P. Schrank
- 👤 Richard M. Coppola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
An electroluminescent device comprising a transparent electrode layer and a segmented electrode layer having an electroluminescent phosphor therebetween, and a contrast enhancing layer between said electroluminescent phosphor and said segmented electrode layer, said contrast enhancing layer comprising a cermet of Cr 2 O 3 and Cr.
Claim 2
Dependent Claim
46 words
An electroluminescent device comprising a transparent electrode layer and a segmented electrode layer having an electroluminescent phosphor therebetween, and a contrast enhancing layer between said electroluminescent phosphor and said segmented electrode layer, said contrast enhancing layer comprising a cermet of Cr 2 O 3 and Cr.
Claim 3
Dependent Claim
17 words
The device of claim 1 wherein said cermet has an electrical resistivity of about 4×10 5 ohm-centimeters.
Claim 4
Dependent Claim
15 words
The device of claim 2 wherein said cermet has a thickness of about 4000 Å.
Claim 5
Dependent Claim
26 words
The device of claim 3 wherein said cermet is applied by sputtering from a target of Cr 2 O 3 and Cr containing about 29% Cr.
Claim 6
Dependent Claim
16 words
The device of claim 4 wherein is employed a sputtering gas mixture of oxygen and argon.
Claim 7
Dependent Claim
17 words
The device of claim 5 wherein the ratio of said oxygen to said argon is about 8.2.
References Cited (Backward Citations)
US3200279A
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US3560784A
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US4096026A
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US4312915A
Cited
GB2039146A
Cited
US4326007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |