US4255689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with resistor means on glass support rods
Assignee: Osram Sylvania Inc
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Filing: 1979-04-16
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Granted: 1981-03-10
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Expires: 1999-04-16
Abstract
Abstract A cathode ray tube including an arc limiting resistor means (42) formed on an extension of the glass rods which align and fix the electrodes of the guns (28). The resistors also include means (54) for centering the guns in the neck of the tube.
Inventors
- 👤 Martin Fischman
- 👤 Joseph L. Hallett
- 👤 Carl W. Penird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:32
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/96; H01J29/86; H01J29/88; H01J2229/00; H01J2229/88; H01J2229/882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
In a cathode ray tube having an evacuated envelope, an electron gun comprised of a plurality of axially aligned spaced apart electrodes including a final electrode disposed within said envelope, said electrodes being maintained in alignment by means of studs projecting therefrom being fixed in glass rods extending substantially parallel to said axis, and an internal electrically conductive layer on an interior surface of said envelope, the improvement comprising: electrical resistor means formed on extensions of said rods which project beyond said final electrode, said resistor means connecting said final anode to said internal electrically conductive layer, said resistor means including means for centering said gun in said tube and comprising on each rod a spaced pair of conductive coatings with a resistor material therebetween and connected thereto, one of each of said pairs of said conductive coatings on each rod being electrically connected to said final anode and the other one of said pairs of conductive coatings being electrically connected to a conductive snubber which is in electrical contact with said conductive layer.
Claim 2
Dependent Claim
174 words
In a cathode ray tube having an evacuated envelope, an electron gun comprised of a plurality of axially aligned spaced apart electrodes including a final electrode disposed within said envelope, said electrodes being maintained in alignment by means of studs projecting therefrom being fixed in glass rods extending substantially parallel to said axis, and an internal electrically conductive layer on an interior surface of said envelope, the improvement comprising: electrical resistor means formed on extensions of said rods which project beyond said final electrode, said resistor means connecting said final anode to said internal electrically conductive layer, said resistor means including means for centering said gun in said tube and comprising on each rod a spaced pair of conductive coatings with a resistor material therebetween and connected thereto, one of each of said pairs of said conductive coatings on each rod being electrically connected to said final anode and the other one of said pairs of conductive coatings being electrically connected to a conductive snubber which is in electrical contact with said conductive layer.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |