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Patent US4443736A successfully refreshed from Google Patents.
US4443736A
Expired / Lapsed
US
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Electron gun for dynamic beam shape modulation
Assignee: RCA Corp
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Filing: 1981-09-23
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Granted: 1984-04-17
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Expires: 2001-09-23
Abstract
Abstract In an electron gun that includes a cathode, a control grid, a screen grid and at least two main focus lens electrodes, an improvement comprises the screen grid including a first portion having a circular aperture, a second portion having at least one elongated aperture and a third portion having a circular aperture. The first and third portions are electrically insulated from the second portion.
Inventors
- 👤 Hsing-Yao Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:59
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/503
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
In a three inline beam electron gun including three inline cathodes, a control grid having three inline apertures, a screen grid and at least two main focus lens electrodes, the improvement comprising said screen grid including three stacked apertured metal plates separated from each other by two electrically insulating members, the two outside plates having three inline apertures and the center plate having at least one elongated aperture effectively extending at least to the outer edges of the two outer apertures of the outside plates.
Claim 2
Dependent Claim
85 words
In a three inline beam electron gun including three inline cathodes, a control grid having three inline apertures, a screen grid and at least two main focus lens electrodes, the improvement comprising said screen grid including three stacked apertured metal plates separated from each other by two electrically insulating members, the two outside plates having three inline apertures and the center plate having at least one elongated aperture effectively extending at least to the outer edges of the two outer apertures of the outside plates.
Claim 3
Dependent Claim
16 words
The electron gun as defined in claim 1 wherein said two outside plates are electrically connected.
References Cited (Backward Citations)
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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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |