Patent US4298818A successfully refreshed from Google Patents.
US4298818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun
Assignee: RCA Licensing Corp
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Filing: 1979-08-29
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Granted: 1981-11-03
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Expires: 1999-08-29
Abstract
Abstract The present invention is an improvement in a multi-beam electron gun for use in a cathode-ray tube. Such gun includes a plurality of cathode assemblies and at least two spaced successive electrodes having aligned apertures therein. The improvement comprises the cathode assemblies and the two electrodes being individually attached to a single ceramic member. The ceramic member is the sole supporting interconnection within the gun between the cathode assemblies and the two electrodes.
Inventors
- 👤 Harry E. McCandless
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:54
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/503
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
In a multi-beam electron gun for use in a cathode-ray tube, said gun including a plurality of cathode assemblies and at least two spaced successive electrodes having aligned apertures therein for passage of a plurality of electron beams, the improvement comprising, said cathode assemblies and the two electrodes being individually attached to a single ceramic member, said ceramic member being the sole supporting interconnection within said gun between said cathode assemblies and two electrodes, said two electrodes being attached to one surface of said ceramic member and the cathode assemblies being attached to an opposite surface of said ceramic member.
Claim 2
Dependent Claim
100 words
In a multi-beam electron gun for use in a cathode-ray tube, said gun including a plurality of cathode assemblies and at least two spaced successive electrodes having aligned apertures therein for passage of a plurality of electron beams, the improvement comprising, said cathode assemblies and the two electrodes being individually attached to a single ceramic member, said ceramic member being the sole supporting interconnection within said gun between said cathode assemblies and two electrodes, said two electrodes being attached to one surface of said ceramic member and the cathode assemblies being attached to an opposite surface of said ceramic member.
Claim 3
Dependent Claim
112 words
In a multi-beam electron gun for use in a cathode-ray tube, said gun including a plurality of cathode assemblies, a control grid electrode, a screen grid electrode and a plurality of other electrodes, the improvement comprising, the cathode assemblies and the control and screen grid electrodes being individually attached to a single ceramic wafer, the control and screen grid electrodes being surface-attached to the same side of the ceramic wafer, said control and screen grid electrodes each having projections of respectively different lengths, extending therefrom which contact and are surface-attached to the ceramic wafer, said projections being of predetermined length to establish a desired spacing between the control and screen grid electrodes.
Claim 4
Dependent Claim
112 words
In a multi-beam electron gun for use in a cathode-ray tube, said gun including a plurality of cathode assemblies, a control grid electrode, a screen grid electrode and a plurality of other electrodes, the improvement comprising, the cathode assemblies and the control and screen grid electrodes being individually attached to a single ceramic wafer, the control and screen grid electrodes being surface-attached to the same side of the ceramic wafer, said control and screen grid electrodes each having projections of respectively different lengths, extending therefrom which contact and are surface-attached to the ceramic wafer, said projections being of predetermined length to establish a desired spacing between the control and screen grid electrodes.
Claim 5
Dependent Claim
38 words
The electron gun as defined in claim 2 wherein the projection on the control grid electrode is a circumferential rib and the projections on the screen grid electrode are flanges extending from ends of the screen grid electrode.
Claim 6
Dependent Claim
33 words
The electron gun as defined in claim 2 wherein the ceramic wafer is flat and includes metalized areas on surfaces thereof to which said cathode assemblies and control and screen grids are welded.
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |