US5196229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated phosphor articles
Assignee: Osram Sylvania Inc
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Filing: 1989-08-21
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Granted: 1993-03-23
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Expires: 2009-08-21
Abstract
Abstract Phosphor particles are coated with a continuous, non-particulate, conformal coating of a metal oxide by suspending the phosphor particles in a gel solution containing a metal alkoxide. The gel suspension is then gelled after which the gelled suspension is dried, during which process the metal alkoxide is converted to metal oxide which coats the particles. Such coated phosphor particles can improve maintenance of lamps in which they are employed.
Inventors
- 👤 Chung N. Chau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:14
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; B; B01; B01J; B01J2/00; B01J2/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A method of providing a continuous, non-particulate, conformal coating on phosphor particles comprising the steps of: suspending phosphor particles in a gel solution containing a metal alkoxide; maintaining the phosphor particles in suspension while causing the suspension to gel; and drying the gelled suspension whereby the metal alkoxide is converted to metal oxide and whereby the phosphor particles are coated with a continuous, non-particulate, conformal coating of the metal oxide, wherein the metal alkoxide is an ethoxy compound and wherein the gel suspension contains ammonium hydroxide as a catalyst.
Claim 2
Independent Claim
89 words
A method of providing a continuous, non-particulate, conformal coating on phosphor particles comprising the steps of: suspending phosphor particles in a gel solution containing a metal alkoxide; maintaining the phosphor particles in suspension while causing the suspension to gel; and drying the gelled suspension whereby the metal alkoxide is converted to metal oxide and whereby the phosphor particles are coated with a continuous, non-particulate, conformal coating of the metal oxide, wherein the metal alkoxide is an ethoxy compound and wherein the gel suspension contains ammonium hydroxide as a catalyst.
References Cited (Backward Citations)
US3544354A
Cited
US3927224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |