US3947715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast warm up cathode for a cathode ray tube
Assignee: GTE Sylvania Inc
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Filing: 1975-06-10
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Granted: 1976-03-30
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Expires: 1995-06-10
Abstract
Abstract A fast warm up cathode comprises a substantially cup-shaped top cap and a hollow cylindrical sleeve axially displaced from the top cap. Means are provided for joining the sleeve and the top cap into an integral unit. The means comprise a plurality of individual rod-like members having extremities substantially flat for attachment to the top cap and the sleeve. The plurality of rod-like members are equally spaced about the periphery of the sleeve and the top cap.
Inventors
- 👤 Peter George Puhak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:37
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
62 words
A fast warm-up cathode for a cathode ray tube comprising: a substantially cup-shaped top cap; a hollow cylindrical sleeve longitudinally axially separated from said top cap; and means joining said sleeve and said top cap into an integral unit, said means comprising a plurality of individual rod-like members having extremities providing substantially flat attachment surfaces for said sleeve and said top cap.
Claim 2
Dependent Claim
62 words
A fast warm-up cathode for a cathode ray tube comprising: a substantially cup-shaped top cap; a hollow cylindrical sleeve longitudinally axially separated from said top cap; and means joining said sleeve and said top cap into an integral unit, said means comprising a plurality of individual rod-like members having extremities providing substantially flat attachment surfaces for said sleeve and said top cap.
Claim 3
Dependent Claim
24 words
The cathode of claim 1 wherein said members are cylindrical in cross-section and said extremities are coined to provide said substantially flat, widened surface.
Claim 4
Dependent Claim
35 words
The cathode of claim 1 wherein said sleeve has a larger diameter than said top cap and said members have an offset formed intermediate said extremities, said offset compensating for the differences in said diameters.
Claim 5
Dependent Claim
35 words
The cathode of claim 3 wherein said substantially flat surfaces are formed by coining opposite sides of said members and fit respectively on the inside of said sleeve and the outside of said top cap.
References Cited (Backward Citations)
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US2421767A
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US2833952A
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US3273003A
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US3333138A
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US3772559A
Cited
US3881124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |