US4806389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating a coated phosphor
Assignee: Osram Sylvania Inc
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Filing: 1987-03-02
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Granted: 1989-02-21
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Expires: 2007-03-02
Abstract
Abstract A method for preventing the hydration/solubilization of the protective oxide coating of a phosphor is described. The method involves coating of the oxide coated phosphor particles with a continuous hydrophobic coating. After the phosphor particles are coated with the continuous hydrophobic coating and the continuous hydrophobic coating cured, they are added to a water-based suspension and subsequently processed into a lamp.
Inventors
- 👤 Thomas E. Peters
- 👤 Roger B. Hunt, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:48
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A phosphor process comprising the following steps: Step 1 - coating phosphor particles having a continuous alumina coating with a continuous hydrophobic coating, said continuous hydrophobic coating consisting essentially of an acrylic polymer; Step 2 - heating the product from step 1 at a temperature and for a period sufficient to cure said continuous hydrophobic coating; Step 3 - adding the product from step 2 to a water based suspension, said water based suspension comprising water and a polyethylene-oxide as a binder; Step 4 - coating an inside surface of a lamp with the product of step 3; Step 5 - lehring the product from step 4 at a temperature sufficient to remove said hydrophobic coating from said phosphor particles having a continuous alumina coating; and Step 6 - processing the product from step 5 into a lamp.
Claim 2
Dependent Claim
138 words
A phosphor process comprising the following steps: Step 1 - coating phosphor particles having a continuous alumina coating with a continuous hydrophobic coating, said continuous hydrophobic coating consisting essentially of an acrylic polymer; Step 2 - heating the product from step 1 at a temperature and for a period sufficient to cure said continuous hydrophobic coating; Step 3 - adding the product from step 2 to a water based suspension, said water based suspension comprising water and a polyethylene-oxide as a binder; Step 4 - coating an inside surface of a lamp with the product of step 3; Step 5 - lehring the product from step 4 at a temperature sufficient to remove said hydrophobic coating from said phosphor particles having a continuous alumina coating; and Step 6 - processing the product from step 5 into a lamp.
Claim 3
Dependent Claim
20 words
A phosphor process in accordance with claim 1 wherein said phosphor particles comprise particles of manganese activated zinc silicate phosphor.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |