Patent US3701915A successfully refreshed from Google Patents.
US3701915A
Expired / Lapsed
US
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Electron beam gun
Assignee: Airco Inc
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Filing: 1971-01-04
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Granted: 1972-10-31
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Expires: 1991-01-04
Abstract
Abstract An electron beam gun is described wherein a pair of elongated filaments are placed parallel to one another in the elongated channel of a focusing electrode.
Inventors
- 👤 Kazumi N Tsujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:13
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/06; H01J37/065; H01J37/30; H01J37/305
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
In an electron beam furnace, an electron beam gun comprising, a focusing electrode defining an elongated open-sided channel, means for connecting said electrode to a first source of potential, at least one accelerating electrode spaced from the open side of said channel defined by said focusing electrode, means for connecting said accelerating electrode to a second source of potential which is substantially more positive than said first source, a pair of elongated filaments of thermionically emissive material, means for supporting said filaments parallel with each other within said channel extending along the length thereof and spaced from said focusing electrode, said filaments being positioned on opposite sides of the longitudinal axis plane of said channel with the space between said filaments being unobstructed, and means for connecting said filaments to a source of heating current.
Claim 2
Dependent Claim
135 words
In an electron beam furnace, an electron beam gun comprising, a focusing electrode defining an elongated open-sided channel, means for connecting said electrode to a first source of potential, at least one accelerating electrode spaced from the open side of said channel defined by said focusing electrode, means for connecting said accelerating electrode to a second source of potential which is substantially more positive than said first source, a pair of elongated filaments of thermionically emissive material, means for supporting said filaments parallel with each other within said channel extending along the length thereof and spaced from said focusing electrode, said filaments being positioned on opposite sides of the longitudinal axis plane of said channel with the space between said filaments being unobstructed, and means for connecting said filaments to a source of heating current.
Claim 3
Dependent Claim
27 words
An electron beam gun according to claim 1 wherein said focusing electrode is a solid body with said channel comprising an elongated recess in a surface thereof.
Claim 4
Dependent Claim
31 words
An electron beam gun according to claim 1 wherein said channel is comprised of a generally flat bottom and a pair of planar sides extending therefrom and diverging from each other.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |