US4338543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CRT With arc suppression means therein
Assignee: RCA Licensing Corp
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Filing: 1979-06-15
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Granted: 1982-07-06
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Expires: 1999-06-15
Abstract
Abstract A CRT comprising an evacuated envelope having an electrically-insulating neck and a beaded electron-gun mount assembly housed in the neck. The beads of the assembly are closely spaced from the inner surface of the neck. An electrically-conducting band is located against the surface, each bead opposite the neck. The band is electrically connected to and supported from one of the electrodes of the mount assembly.
Inventors
- 👤 Richard R. Handel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:36
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/484
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
A cathode-ray tube comprising an evacuated envelope including an electrically-insulating neck, and an electron-gun mount assembly in said neck, said mount assembly comprising a plurality of electrodes including a screen grid electrode and a focus grid electrode closely spaced thereto, said electrodes being mounted on at least two electrically-insulating support rods, said assembly being closely spaced from the inner surface of said neck, and an electrically-conducting band part located against the surface of each of said suppport rods between said focus grid electrode and said neck, said band parts being electrically connected to and supported from said focus grid electrode.
Claim 2
Dependent Claim
100 words
A cathode-ray tube comprising an evacuated envelope including an electrically-insulating neck, and an electron-gun mount assembly in said neck, said mount assembly comprising a plurality of electrodes including a screen grid electrode and a focus grid electrode closely spaced thereto, said electrodes being mounted on at least two electrically-insulating support rods, said assembly being closely spaced from the inner surface of said neck, and an electrically-conducting band part located against the surface of each of said suppport rods between said focus grid electrode and said neck, said band parts being electrically connected to and supported from said focus grid electrode.
Claim 3
Dependent Claim
31 words
The cathode-ray tube defined in claim 1 wherein said band parts are portions of a single band encircling said mount assembly and said band is welded to said focus grid electrode.
Claim 4
Dependent Claim
30 words
The cathode-ray tube defined in claim 1 wherein said band parts are portions of separate bands encircling each support rod, each band being separately welded to said focus grid electrode.
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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |