US3621340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gallium arsenide diode with up-converting phosphor coating
Assignee: AT&T Inc
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Filing: 1969-04-16
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Granted: 1971-11-16
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Expires: 1989-04-16
Abstract
Abstract Adjustable color in the visible spectrum results from use of a gallium arsenide infrared emitting diode provided with a coating of a composition having at least one each of two different anions in some unit cells. The composition exemplified by a variety of oxyhalides contain the cation pair Yb3 -Er3 , Yb3 -Ho3 and mixtures thereof.
Inventors
- 👤 Shobha Singh
- 👤 Legrand G Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:35
CPC Classifications
G; G02; G02F; G02F2/00; G02F2/02; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/777; C09K11/7772; C09K11/7773; F; F21; F21K; F21K2/00; F21K2/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
11 words
Device of claim 2 in which the diode is silicon doped.
Claim 2
Dependent Claim
21 words
Device of claim 1 in which the said minimum contents as set forth are 10 percent Yb and 1/4 percent or
Claim 3
Dependent Claim
40 words
Device of claim 1 in which the said phosphor composition consists essentially of at least two different compounds each containing a cation grouping selected from the groupings consisting of Yb3 -Er3 , Yb3 -Ho3 , and Yb3 -Er3 -Ho3 .
Claim 4
Dependent Claim
23 words
Device of claim 4 in which the phosphor consists essentially of an oxychloride with a chlorine to oxygen ratio of at least 1.5.
Claim 5
Dependent Claim
12 words
Device of claim 5 in which both Er3 and Ho3 are present.
Claim 6
Dependent Claim
18 words
Device of claim 4 in which the phosphor consists essentially of ROCl with both Er3 and Ho3 PRESENT.
Claim 7
Dependent Claim
16 words
Device of claim 4 in which the phosphor consists essentially of ROCl together with M2 FCl.
Claim 8
Dependent Claim
16 words
Device of claim 4 in which the phosphor consists essentially of ROCl together with M1 RF2Cl2.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |