US3870650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Europium-activated rare earth oxide phosphors
Assignee: GTE Sylvania Inc
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Filing: 1973-09-13
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Granted: 1975-03-11
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Expires: 1993-09-13
Abstract
Abstract A particulate cathodoluminescent phosphor is disclosed that has the empirical formula, (Y1 xGdx)2 O3:Eu, wherein x is from 0 to 1, the molar ratio of europium to yttrium and gadolinium being from about 0.1:100 to about 20:100, having at least about 70 percent of parallelepipedonal particles and an overall average size of from about 1 to about 20 microns.
Inventors
- 👤 John L Ferri
- 👤 James E Mathers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:25
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A PARTICULATE CATHODOLUMINESCENT PHOSPHOR HAVING THE EMPIRICAL FORMULA, (Y1-XGDX)2O3:EU, WHEREIN X IS FROM 0 TO 1, THE MOLAR RATIO OF EUROPIUM TO YTTRIUM AND GADOLINIUM BEING FROM ABOUT 0:100 TO AABOUT 20:100, HAVING AT LEAST 70 PERCENT OF PARALLELEPIPEDONAL PARTICLES AND AN OVERALL AVERAGE SIZE OF FROM ABOUT 1 TO ABOUT 20 MICRONS.
Claim 2
Dependent Claim
53 words
A PARTICULATE CATHODOLUMINESCENT PHOSPHOR HAVING THE EMPIRICAL FORMULA, (Y1-XGDX)2O3:EU, WHEREIN X IS FROM 0 TO 1, THE MOLAR RATIO OF EUROPIUM TO YTTRIUM AND GADOLINIUM BEING FROM ABOUT 0:100 TO AABOUT 20:100, HAVING AT LEAST 70 PERCENT OF PARALLELEPIPEDONAL PARTICLES AND AN OVERALL AVERAGE SIZE OF FROM ABOUT 1 TO ABOUT 20 MICRONS.
Claim 3
Dependent Claim
54 words
A particulate cathodoluminescent phosphor having the empirical formula, (Y1 xGdx)2O3:Eu, wherein x is from 0 to 1, the molar ratio of europium to yttrium and gadolinium being from about 0.1:100 to about 20:100, having at least 70 percent of parallelepipedonal particles and an overall average size of from about 1 to about 20 microns.
Claim 4
Dependent Claim
54 words
A particulate cathodoluminescent phosphor having the empirical formula, (Y1 xGdx)2O3:Eu, wherein x is from 0 to 1, the molar ratio of europium to yttrium and gadolinium being from about 0.1:100 to about 20:100, having at least 70 percent of parallelepipedonal particles and an overall average size of from about 1 to about 20 microns.
Claim 5
Dependent Claim
11 words
A phosphor composition according to claim 1 wherein x is 1.
Claim 6
Dependent Claim
16 words
A phosphor composition according to claim 1 wherein x is from about 0.5 to about 0.95.
Claim 7
Dependent Claim
19 words
A phosphor composition according to claim 3 wherein said particle size is from about 3 to about 10 microns.
Claim 8
Dependent Claim
11 words
A phosphor composition according to claim 1 wherein x is 0.
Claim 9
Dependent Claim
13 words
A phosphor composition according to claim 5 wherein said particles are essentially cubical.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |