US5814932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor, cathode-ray tube, fluorescent lamp and radiation intensifying screen
Assignee: Toshiba Corp
•
Filing: 1996-12-30
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Granted: 1998-09-29
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Expires: 2016-12-30
Abstract
Abstract Disclosed is a phosphor suitable for use in a cathode-ray tube, a fluorescent lamp, a radiation intensifying screen, which comprises transparent spherical particles having an average particle size of 0.5 to 20 μm and a ratio of the major diameter to the minor diameter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 μm less in an amount of 5 wt % or less.
Inventors
- 👤 Naotoshi Matsuda
- 👤 Masaaki Tamatani
- 👤 Keiko Albessard
- 👤 Miwa Okumura
- 👤 Takeshi Takahara
- 👤 Takeo Itou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:50
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20; C; C09; C09K; C09K11/00; C09K11/08; C09K11/67; C09K11/671; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7789; G; G21; G21K; G21K4/00; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; G21K2004/06; H01J61/70
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
89 words
A radiation intensifying screen, comprising a screen base, a phosphor layer formed on said screen base, a protection film formed on said phosphor layer, wherein at least a part of the phosphor constituting said phosphor layer comprises transparent spherical particles having an average particle size of 0.5 to 20 μm and a ratio of the major diameter to the minor diameter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 μm or less in an amount of 0.001-5 wt %.
Claim 2
Dependent Claim
89 words
A radiation intensifying screen, comprising a screen base, a phosphor layer formed on said screen base, a protection film formed on said phosphor layer, wherein at least a part of the phosphor constituting said phosphor layer comprises transparent spherical particles having an average particle size of 0.5 to 20 μm and a ratio of the major diameter to the minor diameter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 μm or less in an amount of 0.001-5 wt %.
Claim 3
Dependent Claim
28 words
The radiation intensifying screen according to claim 1, wherein the content of said ultrafine particles of 0.2 μm or less in diameter is 0.01 to 2 wt %.
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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) | 2001-09-28 | 2002-03-30 | 2002-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-28 | 2006-03-30 | 2006-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-28 | 2010-03-30 | 2010-09-29 | $7700.00 | Window Closed / Lapsed |