Patent US3573535A successfully refreshed from Google Patents.
US3573535A
Expired / Lapsed
US
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High-frequency electronic tube having novel grid mounting
Assignee: General Electric Co
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Filing: 1968-11-12
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Granted: 1971-04-06
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Expires: 1988-11-12
Abstract
Abstract A high-frequency electron tube having a novel grid mount is provided to inhibit mechanical distortion of the grid at high temperature. The shape and material selection of the grid support allows the grid to expand and contract at a different rate than the envelope in which it is mounted without damaging the grid.
Inventors
- 👤 Robert M Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:33
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36; H01J19/00; H01J19/42; H01J19/46; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0005; H01J2893/0006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A high-frequency electron discharge device capable of withstanding high temperature, comprising an outer envelope having therein an anode electrode, a cathode electrode and a grid structure including grid conductors closely spaced to said cathode between said anode and cathode and having a peripheral supporting lip thereon; and having grid mounting means therein including grid support means comprising an upright yieldable cylindrical member located between said grid structure and said envelope and secured at one end to said envelope, said support means being constructed of a material having a temperature coefficient of expansion substantially similar to the temperature coefficient of expansion of the material of said grid structure; and grid retention means to retain said grid structure to the opposite end of said yieldable cylindrical member to provide a grid support capable of lateral flexure with temperature changes.
Claim 2
Dependent Claim
137 words
A high-frequency electron discharge device capable of withstanding high temperature, comprising an outer envelope having therein an anode electrode, a cathode electrode and a grid structure including grid conductors closely spaced to said cathode between said anode and cathode and having a peripheral supporting lip thereon; and having grid mounting means therein including grid support means comprising an upright yieldable cylindrical member located between said grid structure and said envelope and secured at one end to said envelope, said support means being constructed of a material having a temperature coefficient of expansion substantially similar to the temperature coefficient of expansion of the material of said grid structure; and grid retention means to retain said grid structure to the opposite end of said yieldable cylindrical member to provide a grid support capable of lateral flexure with temperature changes.
Claim 3
Dependent Claim
41 words
The grid mounting means of claim 1 wherein said envelope is constructed of titanium metal and ceramic materials and the grid structure and grid mounting means are constructed of materials selected from the class consisting of tungsten, molybdenum, or tungsten-molybdenum alloys.
Claim 4
Dependent Claim
32 words
The grid mounting means of claim 1 wherein a spacing shim is placed between said lip of said grid structure and said grid support means to space said grid from said cathode.
Claim 5
Dependent Claim
21 words
The grid mounting means of claim 1 wherein said grid retention means comprises brazing said grid structure to said grid support.
Claim 6
Dependent Claim
33 words
The grid mounting means of claim 1 wherein said grid retention means comprise a concave washer resiliently biased against an upper surface to retain the grid structure nonslidably against said grid support means.
Claim 7
Dependent Claim
90 words
The grid mounting means of claim 1 wherein said grid retention means is constructed of a material having a temperature coefficient of expansion substantially similar to the temperature coefficients of expansion of said grid structure and said grid support means and comprises a cylindrical sleeve having an upper flange inwardly depending therefrom in frictional relationship with said lip on said grid, and a lower flange outwardly depending therefrom and secured to said envelope, said grid retention means providing a resilient downward bias of said lip against said grid support means.
Claim 8
Dependent Claim
27 words
The grid mounting means of claim 1 wherein said cylindrical member comprises a slotted member having equally spaced radial slots therein to form segments of equal size.
Claim 9
Dependent Claim
96 words
In a high-frequency electron discharge device comprising an outer envelope having therein an anode, a cathode, and a grid, the improvement which comprises mounting said grid on a first end of a yieldable cylindrical member having an axis normal to the plane of the grid, said cylindrical mounting member being constructed of a material having a temperature coefficient of expansion substantially similar to the temperature coefficient of expansion of said grid, said cylindrical member being secured at an opposite end to said envelope to provide a grid support capable of uniform lateral yield with temperature change.
Claim 10
Dependent Claim
96 words
In a high-frequency electron discharge device comprising an outer envelope having therein an anode, a cathode, and a grid, the improvement which comprises mounting said grid on a first end of a yieldable cylindrical member having an axis normal to the plane of the grid, said cylindrical mounting member being constructed of a material having a temperature coefficient of expansion substantially similar to the temperature coefficient of expansion of said grid, said cylindrical member being secured at an opposite end to said envelope to provide a grid support capable of uniform lateral yield with temperature change.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |