US4681807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gray body colored zinc sulfide activated with copper
Assignee: Osram Sylvania Inc
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Filing: 1985-07-09
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Granted: 1987-07-21
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Expires: 2005-07-09
Abstract
Abstract A catholuminescent material consisting essentially of particles of copper-activated zinc sulfide cathodoluminescent phosphor having at least a partial coating of a mixture of a blue pigment of cobalt aluminate and a red pigment of iron oxide wherein the weight ratio of said blue pigment to said red pigment is from about 3.5:1 to about 4.5:1 and the weight percent of said pigments are from about 0.2% to about 2% by weight of catholuminescent phosphor. A process for producing said pigmented phosphor comprises forming the appropriate aqueous slurries by proper pH control and then by the addition of colloidal silica, the pigment is coated onto the phosphor particles.
Inventors
- 👤 Harry O. Schulze
- 👤 Ronald E. Karam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:36
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A cathodoluminescent material consisting essentially of particles of copper activated zinc sulfide cathodoluminescent phosphor having at least a partial coating of a mixture of a blue pigment of cobalt aluminate and a red pigment of ferric oxide wherein the ratio of said blue pigment to said red pigment is from about 3.5:1 to about 4.5:1 and the weight percent of said pigments are from about 0.2% to about 2% by weight of said phosphor.
Claim 2
Dependent Claim
74 words
A cathodoluminescent material consisting essentially of particles of copper activated zinc sulfide cathodoluminescent phosphor having at least a partial coating of a mixture of a blue pigment of cobalt aluminate and a red pigment of ferric oxide wherein the ratio of said blue pigment to said red pigment is from about 3.5:1 to about 4.5:1 and the weight percent of said pigments are from about 0.2% to about 2% by weight of said phosphor.
Claim 3
Dependent Claim
17 words
A material according to claim 1 wherein the ratio of red to blue pigment is about 4:1.
Claim 4
Dependent Claim
23 words
A material according to claim 1 wherein the weight percent of said pigments is from about 0.3% to about 1% of said phosphor.
References Cited (Backward Citations)
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Cited
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US3657142A
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US4103069A
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Cited
US4544605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |