US4096406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic electron source with bonded control grid
Assignee: Communications and Power Industries LLC
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Filing: 1976-05-10
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Granted: 1978-06-20
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Expires: 1996-05-10
Abstract
Abstract For a grid-controlled electron source to operate at extremely high frequencies, as in planar triodes, the control grid must be situated very close to the emissive cathode. Mechanical and thermal distortions have put minimum limits on grid spacings and hence on the maximum operating frequency of grid-controlled tubes. To overcome these limits the grid structure is formed as a network of web members which are part of a laminated sheet having metal layers bonded to opposite surfaces of an insulating layer. One metal layer is affixed to the emissive surface of a metallic matrix cathode and the other metal layer forms the control grid.
Inventors
- 👤 George Valentine Miram
- 👤 Erling Louis Lien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:12
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/02; H01J19/04; H01J19/14; H01J23/00; H01J23/02; H01J23/06; H01J23/065
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A method for fabricating a grid-controlled electron source comprising the steps of: forming a continuous sheet laminate by bonding a barrier layer and a metallic layer to opposite sides of a sheet of insulating material, removing separated areas of said laminate to form an array of holes extending through the entire thickness of said laminate, said holes being separated by web members consisting of the original thickness of said web members, bonding the barrier layer side of said web members to the emissive surface of a thermionic cathode, and said removing step being performed prior to said bonding of said laiminate to said emissive surface.
Claim 2
Independent Claim
105 words
A method for fabricating a grid-controlled electron source comprising the steps of: forming a continuous sheet laminate by bonding a barrier layer and a metallic layer to opposite sides of a sheet of insulating material, removing separated areas of said laminate to form an array of holes extending through the entire thickness of said laminate, said holes being separated by web members consisting of the original thickness of said web members, bonding the barrier layer side of said web members to the emissive surface of a thermionic cathode, and said removing step being performed prior to said bonding of said laiminate to said emissive surface.
Claim 3
Dependent Claim
21 words
The method of claim 1 further comprising the step of making electrical contact, insulated from said cathode, to said metallic layer.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said removing of said portions is by abrasion.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein the portion of said cathode adjacent said emissive surface is a porous metal body impregnated with an active salt composition.
Claim 6
Dependent Claim
14 words
The method of claim 4 wherein said porous metal body comprises sintered tungsten particles.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein said salt composition comprises barium and aluminum oxides.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said insulating layer is boron nitride.
Claim 9
Dependent Claim
11 words
The method of claim 1 wherein said barrier layer is metallic.
Claim 10
Dependent Claim
22 words
The method of claim 1 wherein said metallic layer comprises at least one metal of the class consisting of zirconium and titanium.
Claim 11
Dependent Claim
20 words
The method of claim 1 wherein said step of attaching said barrier layer to said emissive surface comprises thermal bonding.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |