US4339501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter-coated phosphor
Assignee: Toshiba Corp
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Filing: 1980-01-28
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Granted: 1982-07-13
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Expires: 2000-01-28
Abstract
Abstract Disclosed is a filter-coated phosphor with improved brightness and contrast property, having phosphor particles coated with filter particles of the same color as that of light emitted from a phosphor, the whole surface of each filter-coated phosphor particle or filter particle being coated with a continuous silica film.
Inventors
- 👤 Kiyoshi Inoue
- 👤 Minoru Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/58; C09K11/582; C09K11/584; C09K11/02; C09K11/025; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7789; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A filter-coated phosphor having phosphor particles coated with filter particles of the same color as that of light emitted from said phosphor and secured to said phosphor particle with a bonding agent, the whole surface of each said filter particle being coated with a continuous silica film wherein said film is formed by treating the filter particles with a solution which is obtained by dissolving silica in an organic alkali solution.
Claim 2
Dependent Claim
71 words
A filter-coated phosphor having phosphor particles coated with filter particles of the same color as that of light emitted from said phosphor and secured to said phosphor particle with a bonding agent, the whole surface of each said filter particle being coated with a continuous silica film wherein said film is formed by treating the filter particles with a solution which is obtained by dissolving silica in an organic alkali solution.
Claim 3
Dependent Claim
20 words
A filter-coated phosphor according to claim 1, wherein the thickness of said continuous silica film is 1 to 200 μm.
Claim 4
Dependent Claim
20 words
A filter-coated phosphor according to claim 1, wherein the thickness of said continuous silica film is 50 to 150 μm.
Claim 5
Dependent Claim
33 words
A filter-coated phosphor according to claim 1 wherein said organic alkali is selected among a group including choline, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, tributylmonoethylammonium hydroxide, trimethylmonooctylammonium hydroxide, and triethylmonophenylammonium hydroxide.
Claim 6
Dependent Claim
20 words
A filter-coated phosphor according to claim 1, wherein said phosphor is silver-activated zinc sulfide, and said filter is cobalt blue.
Claim 7
Dependent Claim
21 words
A filter-coated phosphor according to claim 1, wherein said phosphor is trivalent europium-activated yttrium oxysulfide, and said filter is indium sulfide.
Claim 8
Dependent Claim
22 words
A filter-coated phosphor according to claim 1, wherein said phosphor is trivalent europium-activated yttrium oxysulfide, and said filter is red iron oxide.
Claim 9
Dependent Claim
39 words
A filter-coated phosphor according to claim 1, wherein the weight of said filter accounts for 0.1 to 10% of that of said phosphor, and the weight of said silica accounts for 0.01 to 5% of that of said phosphor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |