Patent US3132275A successfully refreshed from Google Patents.
US3132275A
Expired / Lapsed
US
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Electron gun and cathode heater assembly therefor
Assignee: Varian Medical Systems Inc
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Filing: 1960-05-31
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Granted: 1964-05-05
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Expires: 1980-05-31
Abstract
No abstract record available.
Inventors
- 👤 George K Merdinian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:53
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/028; H01J29/00; H01J29/46; H01J29/48; H01J29/487
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN AN ELECTRON TUBE HAVING AN EVACUATED ENVELOPE, AN ELECTRON GUN COMPRISING A BASE PLATE CONSTITUTING PART OF THE EVACUATED ENVELOPE, A HOLLOW METALLIC SUPPORT CYLINDER DETACHABLY SECURED AT ONE END TO THE BASE PLATE AND EXTENDING INTO THE ENVELOPE, AN ELECTRON EMITTING ASSEMBLY INCLUDING ELEACTRICALLY ENERGIZABLE INDIRECT HEATING MEANS SUPPORTED ON THE END OF THE SUPPORT CYLINDER REMOTE FROM THE BASE PLATE, AN ACCELERATING ANODE WITHIN THE ENVELOPE OPERATIVELY ARRANGED ADJACENT THE EMITTING SURFACE OF THE CATHODE TO ATTRACT ELECTRONS THEREFROM WHEN THE INDIRECT HEATING MEANS IS ENERGIZED, AND HEAT REFLECTOR MEANS SUSPENDED FROM THE END OF SAID CYLINDER REMOTE FROM THE BASE PLATE TO REFLECT HEAT FROM SAID HEATING MEANS TOWARD THE CATHODE.
Claim 2
Dependent Claim
115 words
IN AN ELECTRON TUBE HAVING AN EVACUATED ENVELOPE, AN ELECTRON GUN COMPRISING A BASE PLATE CONSTITUTING PART OF THE EVACUATED ENVELOPE, A HOLLOW METALLIC SUPPORT CYLINDER DETACHABLY SECURED AT ONE END TO THE BASE PLATE AND EXTENDING INTO THE ENVELOPE, AN ELECTRON EMITTING ASSEMBLY INCLUDING ELEACTRICALLY ENERGIZABLE INDIRECT HEATING MEANS SUPPORTED ON THE END OF THE SUPPORT CYLINDER REMOTE FROM THE BASE PLATE, AN ACCELERATING ANODE WITHIN THE ENVELOPE OPERATIVELY ARRANGED ADJACENT THE EMITTING SURFACE OF THE CATHODE TO ATTRACT ELECTRONS THEREFROM WHEN THE INDIRECT HEATING MEANS IS ENERGIZED, AND HEAT REFLECTOR MEANS SUSPENDED FROM THE END OF SAID CYLINDER REMOTE FROM THE BASE PLATE TO REFLECT HEAT FROM SAID HEATING MEANS TOWARD THE CATHODE.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |