US2921218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent devices
Assignee: RCA Corp
•
Filing: 1956-03-01
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Granted: 1960-01-12
•
Expires: 1976-03-01
Abstract
No abstract record available.
Inventors
- 👤 Larach Simon
- 👤 Ross E Shrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:44
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
AN ELECTROLUMINESCENT DEVICE COMPRISING A LAYER CONSISTING ESSENTIALLY OF BORON NITRIDE, AND ELECTRODE MEANS FOR APPLYING AN ELECTRIC FIELD ACROSS SAID LAYER FOR PRODUCING ULTRAVIOLET LIGHT.
Claim 2
Dependent Claim
26 words
AN ELECTROLUMINESCENT DEVICE COMPRISING A LAYER CONSISTING ESSENTIALLY OF BORON NITRIDE, AND ELECTRODE MEANS FOR APPLYING AN ELECTRIC FIELD ACROSS SAID LAYER FOR PRODUCING ULTRAVIOLET LIGHT.
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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |