Patent US4471262A successfully refreshed from Google Patents.
US4471262A
Expired / Lapsed
US
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Cathode ray tube with transparent metal oxide protective layer on phosphor screen
Assignee: Sony Corp
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Filing: 1982-06-10
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Granted: 1984-09-11
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Expires: 2002-06-10
Abstract
Abstract A cathode ray tube having, a panel portion provided with a phosphor screen on its inner surface, a neck portion provided with an electron gun in its inner space, and a funnel portion combined with the panel portion and the neck portion to provide an envelope, in which the electron beam emitted from the electron gun scans the phosphor screen and produces images, and the images are observed from the beam scanning side of the phosphor screen. In the cathode ray tube a thin metal oxide layer is formed on the beam scanning side of the phosphor screen.
Inventors
- 👤 Michio Tamura
- 👤 Teruyasu Suzuki
- 👤 Toshihisa Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:12
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/28; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/124
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
A cathode ray tube comprising: (a) a panel portion provided with a phosphor screen on its inner surface; (b) a neck portion provided with an electron gun in its inner space; and (c) a funnel portion coupling said panel portion and said neck portion, an electron beam emitted from said electron gun scanning said phosphor screen and producing images, and said images being observed from the beam-scanning side of said phosphor screen, characterized in that a thin transparent metal oxide layer is formed on said beam scanning side of said phosphor screen.
Claim 2
Dependent Claim
92 words
A cathode ray tube comprising: (a) a panel portion provided with a phosphor screen on its inner surface; (b) a neck portion provided with an electron gun in its inner space; and (c) a funnel portion coupling said panel portion and said neck portion, an electron beam emitted from said electron gun scanning said phosphor screen and producing images, and said images being observed from the beam-scanning side of said phosphor screen, characterized in that a thin transparent metal oxide layer is formed on said beam scanning side of said phosphor screen.
Claim 3
Dependent Claim
25 words
A cathode ray tube according to claim 1, wherein a thickness of said thin oxide layer is selected in the range from 200Å to 3000Å.
Claim 4
Dependent Claim
31 words
A cathode ray tube according to claim 1, wherein said thin oxide layer is at least one member of the group consisting of Al 2 O 3 ,SiO 2 and SiO.
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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |