Patent US5406147A successfully refreshed from Google Patents.
Patent US5814932A successfully refreshed from Google Patents.
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
•
Granted: 1998-09-29
•
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 20:15
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 %.
References Cited (Backward Citations)
US2049765A
Cited
US2284055A
Cited
US2617773A
Cited
US2807586A
Cited
US2980550A
Cited
US3032428A
Cited
US3097172A
Cited
US3338841A
Cited
US3368980A
Cited
US3440080A
Cited
US3449258A
Cited
US3437432A
Cited
JPS5237581A
Cited
JPS62201989A
Cited
US4863882A
Cited
US4752428A
Cited
JPH01108294A
Cited
US5340673A
Cited
US5442254A
Cited
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 |