Patent US1123029A successfully refreshed from Google Patents.
Patent US4009409A successfully refreshed from Google Patents.
US4009409A
Expired / Lapsed
US
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Fast warmup cathode and method of making same
Assignee: GTE Sylvania Inc
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Filing: 1975-09-02
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Granted: 1977-02-22
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Expires: 1995-09-02
Abstract
Abstract A fast warmup cathode comprises a substrate of nickel or cathode nickel alloy having an outer and an inner surface. At least an area of the outer surface is formed to receive an electron emissive material. The inner surface is provided with a high heat radiating material. The high heat radiating material comprises vacuum deposited aluminum or magnesium which has been fired at a temperature above the melting point of the material to provide a surface which is darker than the unaltered surface of the substrate. aluminum or magnesium which has been
Inventors
- 👤 William E. Buescher
- 👤 Donald R. Kerstetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:53
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J29/00; H01J29/02; H01J29/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
An indirectly heated cathode for an electron discharge device comprising: a formed substrate of a material selected from the group of nickel and cathode nickel alloys, said formed substrate having an outer surface and an inner surface, at least an area of said outer surface being formed to receive an electron emissive material; and a coating of vacuum deposited magnesium on said inner surface, said vacuum deposited magnesium having a darker color than said outer surface after firing at a temperature above the melting point of said vacuum deposited metal.
Claim 2
Dependent Claim
90 words
An indirectly heated cathode for an electron discharge device comprising: a formed substrate of a material selected from the group of nickel and cathode nickel alloys, said formed substrate having an outer surface and an inner surface, at least an area of said outer surface being formed to receive an electron emissive material; and a coating of vacuum deposited magnesium on said inner surface, said vacuum deposited magnesium having a darker color than said outer surface after firing at a temperature above the melting point of said vacuum deposited metal.
Claim 3
Dependent Claim
12 words
The cathode of claim 1 wherein said formed substrate is substantially cup-shaped.
Claim 4
Dependent Claim
12 words
The cathode of claim 1 wherein said formed substrate is substantially tubular.
Claim 5
Dependent Claim
68 words
In a method of fabricating a fast warmup cathode, the steps comprising: vacuum depositing vaporized magnesium upon one side of a cathode substrate of a material selected from the group consisting of nickel and cathode nickel alloys; forming the coated substrate into a cathode body with the coated surface on the interior thereof; and firing said coated cathode body under conditions which cause said coated material to darken.
Claim 6
Dependent Claim
68 words
In a method of fabricating a fast warmup cathode, the steps comprising: vacuum depositing vaporized magnesium upon one side of a cathode substrate of a material selected from the group consisting of nickel and cathode nickel alloys; forming the coated substrate into a cathode body with the coated surface on the interior thereof; and firing said coated cathode body under conditions which cause said coated material to darken.
Claim 7
Dependent Claim
24 words
The method of claim 4 wherein said coated cathode body is fired at a temperature higher than the melting point of the deposited metal.
Claim 8
Dependent Claim
58 words
In a method of fabricating a fast warmup cathode, the steps comprising: vacuum depositing vaporized magnesium upon one side of a cathode substrate of a material selected from the group of nickel and cathode nickel alloys; firing said cathode body under conditions which cause said coated material to darken; and forming said fired substrate into a cathode body.
Claim 9
Dependent Claim
58 words
In a method of fabricating a fast warmup cathode, the steps comprising: vacuum depositing vaporized magnesium upon one side of a cathode substrate of a material selected from the group of nickel and cathode nickel alloys; firing said cathode body under conditions which cause said coated material to darken; and forming said fired substrate into a cathode body.
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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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |