US4779022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling structure for a screen grid electron tube such as a transmitter tetrode
Assignee: Siemens AG
•
Filing: 1987-06-12
•
Granted: 1988-10-18
•
Expires: 2007-06-12
Abstract
Abstract A cooling system for a screen grid electron tube such as a high power, high frequency transmitter tetrode which has coaxial formed electrodes and bushings and has an air cool screen grid terminal formed of two angular screen grid terminal elements 1 and 2 spaced from each other in the axial direction together with their bushings 3 and 4 so as to form a cooling air coaxial passage 7 so as to cool the screen grid terminal elements 1 and 2.
Inventors
- 👤 Rainer Badenhoop
- 👤 Ingo Beling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:58
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38; H01J19/74
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
Apparatus for cooling a screen-grid electron tube having an envelope such as a transmitter tetrode which operates at high power and at high frequencies and which is mounted in a tube holder, said tube having two annular screen-grid terminal elements (1, 2) which are coaxially arranged and are axially spaced from one another, said tube holder having two annular coaxially arranged and axially spaced bushings into which said two annular screen-grid terminal elements (1,2) are mounted and said two bushings (3, 4), forming coaxial cooling air passages (7) between said bushings and said screen-grid terminal elements (1, 2).
Claim 2
Dependent Claim
98 words
Apparatus for cooling a screen-grid electron tube having an envelope such as a transmitter tetrode which operates at high power and at high frequencies and which is mounted in a tube holder, said tube having two annular screen-grid terminal elements (1, 2) which are coaxially arranged and are axially spaced from one another, said tube holder having two annular coaxially arranged and axially spaced bushings into which said two annular screen-grid terminal elements (1,2) are mounted and said two bushings (3, 4), forming coaxial cooling air passages (7) between said bushings and said screen-grid terminal elements (1, 2).
Claim 3
Dependent Claim
89 words
Apparatus for cooling a screen-grid electron tube according to claim 1, wherein said annular screen-grid terminal elements (1, 2) are formed of a metal or alloy which has high thermal conductivity; and a first one of said two bushings (3) is formed of a material which has good thermal conductivity and low radio-frequency losses and a second one of said two bushings (4) is formed of a mechanically stable material which has a thermal expansion coefficient which matches that of the metal-ceramic material used in the vacuum envelope (6).
Claim 4
Dependent Claim
62 words
Apparatus for cooling a screen-grid electron tube according to claim 1 or 2, wherein the first of said two annular screen-grid terminal elements (1) and the first of said two bushing (3) are formed of copper and the second one of said two screen-grid terminal elements (2) and the second of said two bushings bushing (4) are formed of an iron-cobalt-nickel alloy.
Claim 5
Dependent Claim
29 words
Apparatus for cooling a screen-grid electron tube according to claim 1 wherein said tube is used as a transmitter tetrode in radio-frequency tube power amplifiers such as cavity resonators.
References Cited (Backward Citations)
DE162754C
Cited
DE872609C
Cited
US3227905A
Cited
US3567982A
Cited
US3641380A
Cited
US4302701A
Cited
US4295077A
Cited
US4639633A
Cited
US4644217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |