US3860849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel plate with color selection electrodes and color phosphors
Assignee: US Philips Corp
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Filing: 1972-09-13
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Granted: 1975-01-14
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Expires: 1992-09-13
Abstract
Abstract A channel plate with color selection electrodes and color phosphors for use as an image display screen in a color television tube.
Inventors
- 👤 Pieter Schagen
- 👤 Hewson Nicholas Graham King
- 👤 Derek Washington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:59
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
184 words
An image display screen for use in a color television tube, comprising; a channel plate defining a display area and having an input side for receiving electrons from a scanning electron beam and an output side for delivering electrons from channels in said channel plate; a first color selection electrode insulated from and covering at least a portion of the output side of said channel plate but shaped so as to not block the channels of said channel plate; a first phosphor layer corresponding to a first color substantially covering the side of said first color selecting electrode remote from said channel plate; a second color selection electrode coextensive with said channel plate and spaced from and facing said first color phosphor; and a second phosphor layer corresponding to a second color substantially covering the side of said second color selection electrode on the side thereof facing said first color phosphor layer, whereby electrons delivered from said channel plate may be directed to either said first or second phosphor layers by application of appropriate electrical potentials to said first and second color selection electrodes.
Claim 2
Dependent Claim
184 words
An image display screen for use in a color television tube, comprising; a channel plate defining a display area and having an input side for receiving electrons from a scanning electron beam and an output side for delivering electrons from channels in said channel plate; a first color selection electrode insulated from and covering at least a portion of the output side of said channel plate but shaped so as to not block the channels of said channel plate; a first phosphor layer corresponding to a first color substantially covering the side of said first color selecting electrode remote from said channel plate; a second color selection electrode coextensive with said channel plate and spaced from and facing said first color phosphor; and a second phosphor layer corresponding to a second color substantially covering the side of said second color selection electrode on the side thereof facing said first color phosphor layer, whereby electrons delivered from said channel plate may be directed to either said first or second phosphor layers by application of appropriate electrical potentials to said first and second color selection electrodes.
Claim 3
Dependent Claim
82 words
The image display screen as defined in claim 1 and further comprising a third phosphor layer corresponding to a third color covering and coextensive with said second color phosphor layer, whereby through appropriate application of electrical potentials to said first and second selection electrodes electrons delivered from said channel plate may be directed to said first phosphor layer, or directed to said third phosphor layer for absorption therein or directed through said third phosphor layer for absorption in said second phosphor layer.
References Cited (Backward Citations)
US2777084A
Cited
US2862141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |