US3569768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode sleeve effecting maximum heat transfer to top of cathode cap and minimum to cap wall
Assignee: GTE Sylvania Inc
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Filing: 1968-11-21
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Granted: 1971-03-09
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Expires: 1988-11-21
Abstract
Abstract A cathode assembly for use in an electron discharge device wherein one end of the cathode sleeve is closed by a cap having electron emissive material exteriorly disposed thereon. The end portion of the sleeve underlying the sidewall of the cap is formed as a shield to provide a space between the sleeve and the cap except for limited seating and bonding contact therebetween at substantially the rim portion of the cap. Since the cathode assembly so formed provides limited heat conduction and radiation between the sleeve and the cap, the emissive cap area receives the major portion of its operational heat by direct radiation from the heater oriented within the cathode sleeve.
Inventors
- 👤 David Benda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:07
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
260 words
In an electron discharge device, a cathode assembly oriented relative to a control grid electrode comprising: a conductive cathode sleeve having top and bottom open ends defined by upper and lower sidewall portions with an intermediate sidewall portion therebetween; a cathode cap fabricated as a substantially cup-shaped member formed to fit over the upper sidewall portion of said sleeve in a substantially telescoped spaced-apart manner to provide a closure portion having a peripheral sidewall integrally formed substantially perpendicular thereto with the termination thereof defining a height greater than the length of said sleeve upper sidewall portion, said cap having an interior sidewall diameter greater than the exterior diameter of said sleeve upper sidewall portion to provide a shielding space therebetween, the interior surface of said closure portion being substantially spacedly removed from the exterior surface of said upper sidewall portion and narrowly spaced from the top open end of said sleeve to effect both conduction and heat radiation shielding for said cathode cap, the termination area of said cap sidewall being substantially the only area of said cap in limited overlay contact relationship with said sleeve upper sidewall portion whereat at least two spaced apart jointure bonds are effected to provide attachment and limited contact between said cap and said sleeve; electron emissive material disposed on the exterior surface of said cap closure portion; a heater positioned totally within said sleeve; and cathode assembly support means formed to provide positioning of said sleeve in a manner that said cathode emissive material thereon is spaCedly related to said control grid electrode.
Claim 2
Dependent Claim
260 words
In an electron discharge device, a cathode assembly oriented relative to a control grid electrode comprising: a conductive cathode sleeve having top and bottom open ends defined by upper and lower sidewall portions with an intermediate sidewall portion therebetween; a cathode cap fabricated as a substantially cup-shaped member formed to fit over the upper sidewall portion of said sleeve in a substantially telescoped spaced-apart manner to provide a closure portion having a peripheral sidewall integrally formed substantially perpendicular thereto with the termination thereof defining a height greater than the length of said sleeve upper sidewall portion, said cap having an interior sidewall diameter greater than the exterior diameter of said sleeve upper sidewall portion to provide a shielding space therebetween, the interior surface of said closure portion being substantially spacedly removed from the exterior surface of said upper sidewall portion and narrowly spaced from the top open end of said sleeve to effect both conduction and heat radiation shielding for said cathode cap, the termination area of said cap sidewall being substantially the only area of said cap in limited overlay contact relationship with said sleeve upper sidewall portion whereat at least two spaced apart jointure bonds are effected to provide attachment and limited contact between said cap and said sleeve; electron emissive material disposed on the exterior surface of said cap closure portion; a heater positioned totally within said sleeve; and cathode assembly support means formed to provide positioning of said sleeve in a manner that said cathode emissive material thereon is spaCedly related to said control grid electrode.
Claim 3
Dependent Claim
41 words
A cathode assembly according to claim 1 wherein said upper and intermediate sidewall portions have an upper transition area therebetween, and wherein the exterior diameter of said upper sidewall portion is less than the exterior diameter of said upper transition area.
Claim 4
Dependent Claim
95 words
A cathode assembly according to claim 1 wherein the exterior diameter of said upper sidewall portion substantially equals the exterior diameter of the transition area between said upper and intermediate sidewall portions, and wherein said cap sidewall termination is formed as an interiorly protruding rim having an interior diameter of a value to effect seating and limited bonding of said rim on the exterior surface of said upper sidewall portion at substantially the transition area thereof to provide spacing between the interior of said cap sidewall and the exterior of said sleeve upper sidewall portion.
Claim 5
Dependent Claim
98 words
A cathode assembly according to claim 1 wherein the exterior diameter of said upper sidewall portion substantially equals the exterior diameter of the transition area between said upper and intermediate sidewall portion, and wherein said cap sidewall termination is formed as a plurality of interiorly protruding symmetrically arranged rim elements to provide an effective interior diameter of a value to effect limited seating and bonding of said rim elements to portions of the exterior surface of said transition area to provide spacing between the interior of said cap sidewall and the exterior of said sleeve upper sidewall portion.
Claim 6
Dependent Claim
39 words
A cathode assembly according to claim 1 wherein the exterior diameter of said upper sidewall portion decreases in a sequential symmetrical manner from the upper transition area between said upper and intermediate sidewall portions to said top open end.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |