Patent US2721950A successfully refreshed from Google Patents.
US2721950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent cell
Assignee: General Electric Co
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Filing: 1952-08-09
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Granted: 1955-10-25
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Expires: 1972-08-09
Abstract
No abstract record available.
Inventors
- 👤 William W Piper
- 👤 Peter D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
AN ELECTROLUMINESCENT CELL COMPRISING A CRYSTAL OF ZINC FLUORIDE ACTIVATED WITH 1 TO 6% BY WEIGHT OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF MANGANESE, THALLIUM, CERIUM AND LEAD, AND A PAIR OF ELECTRODES OPPOSITELY DISPOSED ON SAID CRYSTAL.
Claim 2
Dependent Claim
40 words
AN ELECTROLUMINESCENT CELL COMPRISING A CRYSTAL OF ZINC FLUORIDE ACTIVATED WITH 1 TO 6% BY WEIGHT OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF MANGANESE, THALLIUM, CERIUM AND LEAD, AND A PAIR OF ELECTRODES OPPOSITELY DISPOSED ON SAID CRYSTAL.
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 |