US4454446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube for a light source
Assignee: Mitsubishi Electric Corp
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Filing: 1981-05-29
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Granted: 1984-06-12
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Expires: 2001-05-29
Abstract
Abstract In a cathode ray tube for a light source, a fluorescent surface adapted to emit light having one of three colors, red, green and blue is formed on the inner surface of a face plate which is provided at one end of a vacuum envelope, and an electron gun is disposed at the opposite end of the vacuum envelope in such a manner as to confront the fluorescent surface, at least the face plate being made of a glass material containing rare earth oxides Nd 2 O 3 and Pr 2 O 3 , so that satisfactory color light and contrast are obtained even under the sun light.
Inventors
- 👤 Hiroo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:01
CPC Classifications
H; H01; H01J; H01J63/00; H01J63/06; H01J31/00; H01J31/08; H01J31/10; H01J31/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A cathode ray tube for a light source comprising: a vacuum envelope; a fluorescent surface formed on the inner surface of a face plate which is provided at one end of said vacuum envelope, said fluorescent surface adapted to emit light having one of three colors, red, green and blue; and an electron gun for generating a flood electron beam, disposed at the other end of said vacuum envelope in such a manner as to confront said fluorescent surface, at least said face plate of said vacuum envelope being made of a glass material containing oxides Nd 2 O 3 , Pr 2 O 3 , Fe 2 O 3 and CeO 2 .
Claim 2
Dependent Claim
114 words
A cathode ray tube for a light source comprising: a vacuum envelope; a fluorescent surface formed on the inner surface of a face plate which is provided at one end of said vacuum envelope, said fluorescent surface adapted to emit light having one of three colors, red, green and blue; and an electron gun for generating a flood electron beam, disposed at the other end of said vacuum envelope in such a manner as to confront said fluorescent surface, at least said face plate of said vacuum envelope being made of a glass material containing oxides Nd 2 O 3 , Pr 2 O 3 , Fe 2 O 3 and CeO 2 .
Claim 3
Dependent Claim
18 words
A cathode ray tube as claimed in claim (1) wherein said fluorescent surface is made of pigment phosphor.
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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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |