Patent US4258283A successfully refreshed from Google Patents.
US4258283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for electron emission
Assignee: OC Oerlikon Balzers AG
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Filing: 1978-08-31
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Granted: 1981-03-24
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Expires: 1998-08-31
Abstract
Abstract A cathode assembly for electron emission, comprises, a heatable support of high-temperature resistant material, an emitter body of lanthanum hexaboride, and an auxiliary body having a surface contact with both the support and the emitter body, which is made of a third material, comprising a sintered material of the class of carbides, nitrides and borides. The surface contact area between the auxiliary body and the support amounts to at least 1/6 of the surface area of the emitter body.
Inventors
- 👤 Wilhelm Brunger
- 👤 Gottfried Mollenstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:52
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15; H01J1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A cathode assembly for electron emission, comprising: a heatable support of a high temperature resistant wire; a rod-shaped emitter body of solid lanthanum hexaboride; and an auxiliary body having a surface contact with both the support and the emitter body and being made of sintered tantalum carbide; said auxiliary body embracing said emitter body along a portion of the length thereof at one end of said emitter body which is embedded in said auxiliary body; the surface contact area between said auxiliary body and said support amounting to at least 1/6 of the surface area of said emitter body and said auxiliary body and said emitter body have a surface contact area therebetween amounting to at least 1/6 of the surface area of said emitter body.
Claim 2
Dependent Claim
126 words
A cathode assembly for electron emission, comprising: a heatable support of a high temperature resistant wire; a rod-shaped emitter body of solid lanthanum hexaboride; and an auxiliary body having a surface contact with both the support and the emitter body and being made of sintered tantalum carbide; said auxiliary body embracing said emitter body along a portion of the length thereof at one end of said emitter body which is embedded in said auxiliary body; the surface contact area between said auxiliary body and said support amounting to at least 1/6 of the surface area of said emitter body and said auxiliary body and said emitter body have a surface contact area therebetween amounting to at least 1/6 of the surface area of said emitter 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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |