US4825124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor particle, fluorescent lamp, and manufacturing method
Assignee: Osram Sylvania Inc
•
Filing: 1987-04-29
•
Granted: 1989-04-25
•
Expires: 2007-04-29
Abstract
Abstract A phosphor particle having a non-particulate, conformal aluminum oxide coating and a fluorescent lamp incorporating aluminum oxide coated phophor particles are disclosed. A method for improving the lumen maintenance of a fluorescent lamp is also disclosed. The method involves applying a non-particulate, conformal aluminum oxide coating to the outer surface of individual particles of a finely-divided fluorescent lamp phosphor, applying the coated phosphor particles to a fluorescent lamp envelope, and processing the phosphor coated envelope into a finished lamp.
Inventors
- 👤 A. Gary Sigai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:23
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/02; C09K11/025
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
19 words
A particle of a finely-divided fluorescent lamp phosphor having a nonparticulate, conformal coating of aluminum oxide surrounding the particle.
Claim 2
Dependent Claim
19 words
A particle of a finely-divided fluorescent lamp phosphor having a nonparticulate, conformal coating of aluminum oxide surrounding the particle.
Claim 3
Dependent Claim
15 words
A particle in accordance with claim 1 wherein the phospor is alkaline earth halophosphate phosphor.
Claim 4
Dependent Claim
15 words
A particle in accordance with claim 1 wherein the phosphor is manganese-doped zinc orthosilicate phosphor.
Claim 5
Dependent Claim
21 words
A particle in accordance with claim 1 wherein the coating has a thickness greater than or equal to approximately 100 Angstroms.
Claim 6
Dependent Claim
28 words
A phosphor particle having an aluminum oxide coating surrounding its outer surface, said coating being of a conformal nature and not consisting of individual particles of aluminum oxide.
Claim 7
Dependent Claim
28 words
A phosphor particle having an aluminum oxide coating surrounding its outer surface, said coating being of a conformal nature and not consisting of individual particles of aluminum oxide.
Claim 8
Dependent Claim
16 words
A phosphor particle in accordance with claim 5 wherein said phosphor is manganese doped zinc orthosilicate.
Claim 9
Dependent Claim
44 words
Particles of a phosphor, each phosphor particle being surrounded by a nonparticulate, conformal coating of aluminum oxide, said particles, when incorporated into a fluorescent lamp, providing a lamp having a higher maintenance after 1000 hours of operation than a lamp incorporating uncoated phosphor particles.
Claim 10
Dependent Claim
44 words
Particles of a phosphor, each phosphor particle being surrounded by a nonparticulate, conformal coating of aluminum oxide, said particles, when incorporated into a fluorescent lamp, providing a lamp having a higher maintenance after 1000 hours of operation than a lamp incorporating uncoated phosphor particles.
Claim 11
Dependent Claim
19 words
Particles of a phosphor in accordance with claim 7 wherein said phosphor comprises cool white alkaline earth halophosphate phosphor.
Claim 12
Dependent Claim
17 words
Particles of a phosphor in accordance with claim 7 wherein said phosphor comprises manganese-doped zinc orthosilicate phosphor.
Claim 13
Dependent Claim
41 words
Particles of manganese-doped zinc orthosilicate phosphor, each particle being surrounded by a nonparticulate, conformal coating of aluminum oxide, said particles when incorporated into a fluorescent lamp providing a lamp with maintenance of at least about 95% after 1000 hours of operation.
Claim 14
Dependent Claim
41 words
Particles of manganese-doped zinc orthosilicate phosphor, each particle being surrounded by a nonparticulate, conformal coating of aluminum oxide, said particles when incorporated into a fluorescent lamp providing a lamp with maintenance of at least about 95% after 1000 hours of operation.
References Cited (Backward Citations)
US2151496A
Cited
US2238784A
Cited
US2331306A
Cited
US2386277A
Cited
US2586304A
Cited
US2817599A
Cited
US2878137A
Cited
US2920003A
Cited
US2971859A
Cited
US3047512A
Cited
US3067356A
Cited
US3141990A
Cited
US3251337A
Cited
US3408223A
Cited
US3549412A
Cited
US3636352A
Cited
US3875449A
Cited
US3599029A
Cited
US3923682A
Cited
GB1343250A
Cited
US3886396A
Cited
US3845343A
Cited
US3963639A
Cited
US3984587A
Cited
DE2450435A1
Cited
US4289991A
Cited
US4079288A
Cited
US3995191A
Cited
US4058639A
Cited
US4208448A
Cited
US4287229A
Cited
US4473634A
Cited
US4243909A
Cited
US4339501A
Cited
US4440800A
Cited
US4396863A
Cited
DE3032225A1
Cited
US4515827A
Cited
US4639637A
Cited
US4670688A
Cited
US4459507A
Cited
US4505720A
Cited
US4691140A
Cited
US4585673A
Cited
US4710674A
Cited
JPH05222579A
Cited
JPH05222584A
Cited
JPH05222586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |