US3659136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gallium arsenide junction diode-activated up-converting phosphor
Assignee: AT&T Inc
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Filing: 1969-04-16
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Granted: 1972-04-25
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Expires: 1989-04-16
Abstract
Abstract Electro-luminescent output in the visible spectrum results from use of a GaAs infrared-emitting diode provided with a coating of a compound having at least one each of two different anions or at least one anion vacancy in some unit cells. The compound, exemplified by the oxychlorides and fluorochlorides, contains the ion pair Yb3 -Er3 , Yb3 -Ho3 , Yb3 -Tm3 or mixtures thereof.
Inventors
- 👤 William H Grodkiewicz
- 👤 Shobha Singh
- 👤 Le Grand G Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
F; F21; F21K; F21K2/00; F21K2/005; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/777; C09K11/7772; C09K11/7773; G; G02; G02F; G02F2/00; G02F2/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
Device of claim 1 in which the said phosphor contains an ion combination selected from the group consisting of Yb3 -Er3 , Yb3 -Ho3 , Yb3 -Tm3 and Yb3 -Er3 -Ho3 .
Claim 2
Dependent Claim
14 words
Device of claim 2 in which the said ion combination is Yb3 -Er3 .
Claim 3
Dependent Claim
12 words
Device of claim 1 in which a is from 0.1 to 0.8.
Claim 4
Dependent Claim
28 words
Device of claim 1 in which a is from 0.10 to 0.999175, b is from 0.000625 to 0.1, c is from 0.0002 to 0.02 and d is 0.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |