US3770934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam heating apparatus
Assignee: Varian Medical Systems Inc
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Filing: 1971-10-29
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Granted: 1973-11-06
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Expires: 1991-10-29
Abstract
Abstract Electron beam heating apparatus for heating a large area workpiece in a vacuumized area by electron bombardment, including means for forming and beaming a plurality of ribbon-shaped electron beams which combine into a single beam of uniform current density and large cross-section for heating the workpiece.
Inventors
- 👤 J Randmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:46
CPC Classifications
B; B23; B23K; B23K15/00; B23K15/0013; H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/06; H01J37/063
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
Electron beam heating apparatus comprising an enclosure having a first portion containing means for supporting work to be heated and a second portion containing an electron gun, said electron gun comprising a plurality of electron emissive filaments for generating respective spaced ribbon-shaped electron beams and a control electrode having elongated cavities therein surrounding the respective filaments for directing the beams without deflection simultaneously onto said work, each of said beams having some amount of spreading and at a known distance from the source means adajcent edges of the beams are joined and form a continuous broad single area of relatively uniform electron density, said work being located at said distance from the source means whereby it is substantially uniformly heated throughout a selected broad area by said electrons, and means for evacuating said enclosure to a predetermined degree.
Claim 2
Dependent Claim
138 words
Electron beam heating apparatus comprising an enclosure having a first portion containing means for supporting work to be heated and a second portion containing an electron gun, said electron gun comprising a plurality of electron emissive filaments for generating respective spaced ribbon-shaped electron beams and a control electrode having elongated cavities therein surrounding the respective filaments for directing the beams without deflection simultaneously onto said work, each of said beams having some amount of spreading and at a known distance from the source means adajcent edges of the beams are joined and form a continuous broad single area of relatively uniform electron density, said work being located at said distance from the source means whereby it is substantially uniformly heated throughout a selected broad area by said electrons, and means for evacuating said enclosure to a predetermined degree.
Claim 3
Dependent Claim
128 words
Electron beam heating apparatus comprising a work chamber containing means for supporting work to be heated, and a source chamber connected with said work chamber and adapted to be connected to a source of current and containing therein a source of electrons and means for directing electrons therefrom onto work in said chamber, said source of electrons comprising means for generating simultaneously a plurality of static ribbon-shaped beams, each of said beams having some amount of spreading and at a known distance from said beam generating means adjacent edges of the beams are joined and form a continuous broad single area of relatively uniform electron density, and said work is located at said distance from the beam generating means whereby it is substantially uniformly heated by said electrons.
Claim 4
Dependent Claim
128 words
Electron beam heating apparatus comprising a work chamber containing means for supporting work to be heated, and a source chamber connected with said work chamber and adapted to be connected to a source of current and containing therein a source of electrons and means for directing electrons therefrom onto work in said chamber, said source of electrons comprising means for generating simultaneously a plurality of static ribbon-shaped beams, each of said beams having some amount of spreading and at a known distance from said beam generating means adjacent edges of the beams are joined and form a continuous broad single area of relatively uniform electron density, and said work is located at said distance from the beam generating means whereby it is substantially uniformly heated by said electrons.
Claim 5
Dependent Claim
75 words
Apparatus as set forth in claim 2 wherein said source of electrons comprises a control electrode having a plurality of parallel Grooves in one surface thereof directed toward said work, said beam generating means comprises filaments disposed in respective grooves, and support means for said control electrode is mounted on a portion of said source chamber and is electrically connected to said filaments whereby filament current may be conducted from said portion to the filaments.
Claim 6
Dependent Claim
30 words
Apparatus as set forth in claim 5 wherein means is provided for removably connecting said portion of the source chamber to said work chamber to permit interchanging of electron sources.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |