US2721808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent cell
Assignee: General Electric Co
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Filing: 1951-11-14
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Granted: 1955-10-25
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Expires: 1971-11-14
Abstract
No abstract record available.
Inventors
- 👤 Roberts Shepard
- 👤 Ferd E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; Y; Y10; Y10S; Y10S116/00; Y10S116/35; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 0
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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) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |