US4153572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet emitting CeYMg aluminate fluorescent lamp phosphor for psoriasis treatment
Assignee: GTE Sylvania Inc
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Filing: 1978-06-14
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Granted: 1979-05-08
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Expires: 1998-06-14
Abstract
Abstract This invention relates to a CeYMg Aluminate fluorescent lamp phosphor which emits ultraviolet radiation in a preferred region of the electromagnetic spectrum proven useful for the treatment of psoriasis. The phosphor in fluorescent lamps shows improved performance for this application over other phosphors known to the art.
Inventors
- 👤 Robert W. Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:56
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7774
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
Cerium yttrium magnesium aluminate phosphor exhibiting a hexagonal magneto plumbite structure and having the molar formula of Ce.sub.x Y.sub.y Mg.sub.z Al.sub.11 O.sub.16.5 + 3/2 (x+y)+z; where x is within the range 0.375 and 0.750, y is within the range of 0.050 and 0.350 and z is within the range 0.500 and 2.000, and where the sum of x and y are equal to or less than 1.0.
Claim 2
Dependent Claim
67 words
Cerium yttrium magnesium aluminate phosphor exhibiting a hexagonal magneto plumbite structure and having the molar formula of Ce.sub.x Y.sub.y Mg.sub.z Al.sub.11 O.sub.16.5 + 3/2 (x+y)+z; where x is within the range 0.375 and 0.750, y is within the range of 0.050 and 0.350 and z is within the range 0.500 and 2.000, and where the sum of x and y are equal to or less than 1.0.
Claim 3
Dependent Claim
36 words
The cerium yttrium magnesium aluminate phosphor of claim 1 where x is within the range of 0.550 and 0.750, y is within the range 0.050 and 0.250 and z is within the range 0.500 and 1.500.
Claim 4
Dependent Claim
25 words
The cerium magnesium aluminate phosphor of claim 2 having a molar formula of approximately Ce.sub.0.60± 0.5 Y.sub.0.15± .05 Mg.sub.0.60± .15 Al.sub.11 O.sub.18.2± .3 -- .
References Cited (Backward Citations)
US4026816A
Cited
US4088922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |