Patent US3632090A successfully refreshed from Google Patents.
Patent US3040202A successfully refreshed from Google Patents.
US3040202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent cell and method
Assignee: Westinghouse Electric Corp
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Filing: 1958-07-03
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Granted: 1962-06-19
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Expires: 1978-07-03
Abstract
No abstract record available.
Inventors
- 👤 Lehmann Willi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:33
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
THE METHOD OF INCREASING THE EFFICIENCY OF ELECTROLUMINESCENT LIGHT EMISSION OBTAINABLE FROM FINELY-DIVIDED ACTIVATED ZINC SULFIDE ELECTROLUMINESCENT PHOSPHOR PARTICLES, WHICH METHOD COMPRISES CONTACTING SAID FINELY-DIVIDED PHOSPHOR PARTICLES WITH STRONG HYDROCHLORIC ACID, ALLOWING SAID ACID TO DISSOLVE OUTER SURFACES OF SAID FINELYDIVIDED PARTICLES TO REDUCE BY MORE THAN ABOUT 35% THE AVERAGE DIAMETER OF SAID PARTICLES AND TO AN AVERAGE PARTICLE DIAMETER OF FROM ABOUT 2 TO ABOUT 5 MICRONS, AND SEPARATING UNDISSOLVED PHOSPHOR PARTICLES FROM SAID ACID AND PHOSPHOR DISSOLVED THEREIN.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |