Patent US3650824A successfully refreshed from Google Patents.
US3650824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent display panel
Assignee: Westinghouse Electric Corp
•
Filing: 1969-09-15
•
Granted: 1972-03-21
•
Expires: 1989-09-15
Abstract
Abstract An electroluminescent display device comprised of an electroluminescent layer having a large area front electrode and a plurality of back electrodes in which coatings operatively associated with the back electrodes eliminate dark gaps between the light emitting electrodes.
Inventors
- 👤 Zoltan P J Szepesi
- 👤 Michael A Novice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:32
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
The electroluminescent display device set forth in claim 1 in which said resistance cOating exhibits the property of a decrease of resistance in response to a decrease in voltage.
Claim 2
Dependent Claim
36 words
The electroluminescent display device of claim 2 in which said resistance coating is connected between adjacent back electrode members and the voltage difference between said adjacent back electrode members modifies the resistance of said resistance coating.
Claim 3
Dependent Claim
42 words
The device set forth in claim 1 in which said resistance coating is provided over the region of said second side of said electroluminescent layer which are not covered by said back electrodes and being in electrical contact with said back electrodes.
Claim 4
Dependent Claim
24 words
The device set forth in claim 1 in which said resistance coating exhibits the property of a reduction in resistance in response to radiation.
Claim 5
Dependent Claim
24 words
The device set forth in claim 5 in which said resistance coating is a photoconductive material responsive to the emission from said electroluminescent layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |