US4292565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadow mask assembly for a cathode ray tube
Assignee: Toshiba Corp
•
Filing: 1979-04-19
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Granted: 1981-09-29
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Expires: 1999-04-19
Abstract
Abstract A cathode ray tube in which a shadow mask assembly constituted by a shadow mask and a mask frame is positioned to face a phosphor screen formed on the inner face of a panel at a predetermined distance. The shadow mask and/or the mask frame is plated with a nickel film 0.5 to 3.0 microns thick and is subsequently blackened, thereby preventing a black oxide film from peeling off the shadow mask assembly.
Inventors
- 👤 Masaharu Kanto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:08
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07; H01J2229/00; H01J2229/07; H01J2229/0727; H01J2229/0777; H01J2229/0783
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
A shadow mask assembly for a cathode ray tube, comprising: a shadow mask made of steel; and a mask frame made of steel; at least one of said shadow mask and mask frame having a diffusion layer including nickel and iron and a black oxide layer including mainly iron oxide, the oxide layer being formed on the diffusion layer.
Claim 2
Dependent Claim
59 words
A shadow mask assembly for a cathode ray tube, comprising: a shadow mask made of steel; and a mask frame made of steel; at least one of said shadow mask and mask frame having a diffusion layer including nickel and iron and a black oxide layer including mainly iron oxide, the oxide layer being formed on the diffusion layer.
Claim 3
Dependent Claim
18 words
A cathode ray tube according to claim 1, wherein said diffusion layer is 1.0 to 2.0 micron thick.
Claim 4
Dependent Claim
27 words
A cathode ray tube according to claim 1, wherein said shadow mask is made of low carbon steel, and said mask frame is made of mild steel.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |