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US3662211A
Expired / Lapsed
US
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Cathode construction
Assignee: General Electric Co
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Filing: 1970-01-15
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Granted: 1972-05-09
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Expires: 1990-01-15
Abstract
Abstract Structures and methods are disclosed for accelerating the warmup time of an electron discharge device having an indirectly heated cathode either by coating the cathode with a high heat absorption material or by increasing the heat radiation properties of the heater.
Inventors
- 👤 Walter T Millis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:38
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A cathode support for an indirectly heated cathode for electron discharge devices, comprising a base element of cathode nickel alloy, and a cladding on one surface of said element, said cladding consisting of a selectively oxidized alloy comprising chromium, nickel, and iron having an oxide of chromium thereon to provide a relatively high heat-absorptive means, said element being adapted to support on an opposed surface thereof an electron-emissive material.
Claim 2
Dependent Claim
69 words
A cathode support for an indirectly heated cathode for electron discharge devices, comprising a base element of cathode nickel alloy, and a cladding on one surface of said element, said cladding consisting of a selectively oxidized alloy comprising chromium, nickel, and iron having an oxide of chromium thereon to provide a relatively high heat-absorptive means, said element being adapted to support on an opposed surface thereof an electron-emissive material.
Claim 3
Dependent Claim
50 words
The cathode support as defined in claim 1 wherein said base element is a tubular member having electron-emissive material on the outer surface thereof and wherein the chromium, nickel, and iron alloy further comprises an oxide of chromium on the inner surface of said tubular member as said heat-absorbing means.
Claim 4
Dependent Claim
77 words
A process for forming a cathode support for an indirectly heated cathode for electron discharge devices comprising: a. cladding a cathode nickel sheet with a chrome-nickel-iron alloy; b. forming the clad sheet into a cathode support; and c. selectively oxidizing in a wet hydrogen atmosphere the chrome metal portion of said alloy on said support at an elevated temperature to form an oxide of chrome on said alloy, said wet hydrogen atmosphere inhibiting the oxidation of nickel.
Claim 5
Dependent Claim
77 words
A process for forming a cathode support for an indirectly heated cathode for electron discharge devices comprising: a. cladding a cathode nickel sheet with a chrome-nickel-iron alloy; b. forming the clad sheet into a cathode support; and c. selectively oxidizing in a wet hydrogen atmosphere the chrome metal portion of said alloy on said support at an elevated temperature to form an oxide of chrome on said alloy, said wet hydrogen atmosphere inhibiting the oxidation of nickel.
Claim 6
Dependent Claim
18 words
The process of claim 3 wherein said support is selectively oxidized at a temperature of about 1,000* C.
Claim 7
Dependent Claim
63 words
A process for forming a cathode support for an indirectly heated cathode for electron discharge devices comprising: a. cladding a cathode nickel sheet with a chrome-nickel-iron alloy b. forming the clad sheet into a cathode support; and c. selectively oxidizing the chrome metal portion of said alloy on said support at an elevated temperature to form an oxide of chrome on said alloy.
Claim 8
Dependent Claim
63 words
A process for forming a cathode support for an indirectly heated cathode for electron discharge devices comprising: a. cladding a cathode nickel sheet with a chrome-nickel-iron alloy b. forming the clad sheet into a cathode support; and c. selectively oxidizing the chrome metal portion of said alloy on said support at an elevated temperature to form an oxide of chrome on said alloy.
References Cited (Backward Citations)
US1872359A
Cited
US2057124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |