US5433888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor composition, phosphor-coating composition, discharge lamp and preparation method thereof
Assignee: Nichia Corp
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Filing: 1993-09-20
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Granted: 1995-07-18
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Expires: 2013-09-20
Abstract
Abstract A phosphor composition contains phosphor particles and a water-soluble rare earth compound uniformly covering the surfaces of the phosphor particles. The rare earth compound is present in an amount of from 0.001 to 5% by weight in terms of the corresponding rare earth oxide, based on the weight of the phosphor particles.
Inventors
- 👤 Kouichi Okada
- 👤 Toshiaki Tateiwa
- 👤 Tetsuya Sadamoto
- 👤 Yoshihito Hario
- 👤 Yuji Itsuki
- 👤 Masato Fujiwara
- 👤 Osamu Sakai
- 👤 Kenji Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:12
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/46; C; C09; C09K; C09K11/00; C09K11/02; C09K11/025
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
A phosphor-coating composition which is to be coated on an inner surface of a fluorescent lamp, said composition comprising: halophosphate phosphor particles; a water-soluble organic binder comprising polyethylene oxide in an amount sufficient to provide the composition with a viscosity of about 20 to 60 centipoises; a water-soluble adhesive material for increasing the adhesive strength between said phosphor particles and the inner surface of the lamp, said adhesive material comprising at least one water-soluble lanthanum compound or a derivative thereof in an amount of from 0.001 to 5% by weight in terms of a corresponding lanthanum oxide, based on the total weight of said halophosphate phosphors; and an aqueous medium dissolving said organic binder and said lanthanum compound or derivative thereof, and dispersing said halophosphate particles therein.
Claim 2
Dependent Claim
127 words
A phosphor-coating composition which is to be coated on an inner surface of a fluorescent lamp, said composition comprising: halophosphate phosphor particles; a water-soluble organic binder comprising polyethylene oxide in an amount sufficient to provide the composition with a viscosity of about 20 to 60 centipoises; a water-soluble adhesive material for increasing the adhesive strength between said phosphor particles and the inner surface of the lamp, said adhesive material comprising at least one water-soluble lanthanum compound or a derivative thereof in an amount of from 0.001 to 5% by weight in terms of a corresponding lanthanum oxide, based on the total weight of said halophosphate phosphors; and an aqueous medium dissolving said organic binder and said lanthanum compound or derivative thereof, and dispersing said halophosphate particles therein.
Claim 3
Dependent Claim
20 words
The composition according to claim 1, wherein said lanthanum compound is selected from lanthanum nitrate, lanthanum chloride, and lanthanum acetate.
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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) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |