US5223341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor containing barium and lead
Assignee: Osram Sylvania Inc
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Filing: 1991-05-23
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Granted: 1993-06-29
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Expires: 2011-05-23
Abstract
Abstract A phosphor of the type utilized in a fluorescent lamp and which includes core elements barium, lead, silicon, and oxygen where a continuous, conformal outer coating of hydration and solubilization resistant aluminum oxide, which is impermeable to migration of the core elements, surrounds the core whereby the outer surface of the core is substantially entirely free of the core elements.
Inventors
- 👤 A. Gary Sigai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:18
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/08; C09K11/66; C09K11/666; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
70 words
A particle of fluorescent lamp phosphor for emitting radiation for skin tanning comprising a core of lead activated barium silicate containing core elements comprising barium, lead, silicon and oxygen, said core having a continuous conformal annealed outer coating of substantially hydration and solubilization resistant aluminum oxide surrounding said core, said coating being impermeable to migration of said core elements and having an outer surface entirely free of said core elements.
Claim 2
Dependent Claim
70 words
A particle of fluorescent lamp phosphor for emitting radiation for skin tanning comprising a core of lead activated barium silicate containing core elements comprising barium, lead, silicon and oxygen, said core having a continuous conformal annealed outer coating of substantially hydration and solubilization resistant aluminum oxide surrounding said core, said coating being impermeable to migration of said core elements and having an outer surface entirely free of said core elements.
Claim 3
Dependent Claim
29 words
A particle of fluorescent lamp phosphor for emitting radiation for skin tanning in accordance with claim 1 wherein said core elements consist entirely of barium, lead, silicon and oxygen.
Claim 4
Dependent Claim
26 words
A particle of fluorescent lamp phosphor for emitting radiation for skin tanning in accordance with claim 2 wherein said outer coating includes partially crystalline aluminum oxide.
Claim 5
Dependent Claim
26 words
A particle of fluorescent lamp phosphor for emitting radiation for skin tanning in accordance with claim 3 wherein said outer coating includes a spinel alumina phase.
Claim 6
Dependent Claim
52 words
A particle of fluorescent lamp phosphor for emitting radiation for skin tanning in accordance with claim 4 wherein said outer coating is impermeable to migration of said core elements when treated with an aqueous acid solution having a degree of acidity less than the degree of acidity required for decomposing said coating.
Claim 7
Dependent Claim
70 words
A particle of phosphor of the type having a coated core and for use in a fluorescent lamp wherein said core comprises core elements of barium, lead and silicon, said core having a continuous conformal annealed outer coating of substantially hydration and solubilization resistant aluminum oxide surrounding said core, said coating being impermeable to migration of said core elements and having an outer surface entirely free of said core elements.
Claim 8
Dependent Claim
70 words
A particle of phosphor of the type having a coated core and for use in a fluorescent lamp wherein said core comprises core elements of barium, lead and silicon, said core having a continuous conformal annealed outer coating of substantially hydration and solubilization resistant aluminum oxide surrounding said core, said coating being impermeable to migration of said core elements and having an outer surface entirely free of said core elements.
Claim 9
Dependent Claim
26 words
A particle of phosphor in accordance with claim 6 wherein said core elements comprising barium, silicon and oxygen are in the form of a barium silicate.
Claim 10
Dependent Claim
22 words
A particle of phosphor in accordance with claim 7 wherein said outer coating consists essentially of an amorphous coating having been annealed.
Claim 11
Dependent Claim
18 words
A particle of phosphor in accordance with claim 8 wherein said outer coating includes partially crystalline aluminum oxide.
Claim 12
Dependent Claim
18 words
A particle of phosphor in accordance with claim 9 wherein said outer coating includes a spinel alumina phase.
Claim 13
Dependent Claim
44 words
A particle of phosphor in accordance with claim 10 wherein said outer coating is impermeable to migration of said core elements when treated with an aqueous acid solution having a degree of acidity less than the degree of acidity required for decomposing said coating.
Claim 14
Dependent Claim
75 words
A particle of phosphor of the type utilized in a fluorescent lamp and characterized by the absence of manganese, tungsten and zinc comprising a core of core elements comprising barium, lead, silicon and oxygen, said core having a continuous, conformal annealed outer coating of substantially hydration and solubilization resistant aluminum oxide surrounding said core, said coating being impermeable to migration of said core elements and having an outer surface entirely free of said core elements.
Claim 15
Dependent Claim
75 words
A particle of phosphor of the type utilized in a fluorescent lamp and characterized by the absence of manganese, tungsten and zinc comprising a core of core elements comprising barium, lead, silicon and oxygen, said core having a continuous, conformal annealed outer coating of substantially hydration and solubilization resistant aluminum oxide surrounding said core, said coating being impermeable to migration of said core elements and having an outer surface entirely free of said core elements.
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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) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |