US3588588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron device with exiting permanent magnet free from magnetic short-circuiting by frame
Assignee: Panasonic Holdings Corp
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Filing: 1969-06-16
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Granted: 1971-06-28
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Expires: 1989-06-16
Abstract
Abstract A MAGNETRON DEVICE IN WHICH AN UPPER INSULATOR VESSEL INCLUDING THEREIN CATHODE LEAD MEMBERS EXTENDING FROM A CATHODE CONTAINED, TOGETHER WITH AN ANODE, A CAVITY RESONATOR AND MAGNETIC POLE PIECES, IN A METAL VESSEL IS DISPOSED IN AN AXIAL HOLE IN A CYLINDRICAL OR CONICAL PERMANENT MAGNET FOR EXCITING A MAGNETRON WITH AN INTERSTICE THEREBETWEEN TO DEFINE A VENTILATION FLUE FOR EFFECTIVELY COOLING THE UPPER INSULATOR VESSEL AND THE PERMANENT MAGNET TO PREVENT THE INSULATOR VESSEL FROM BREAKAGE DUE TO UNEVEN HEATING OF THE INSULATOR VESSEL BY MAKING THE DISTRIBUTION OF THE TEMPERATURE OF THE INSULATOR VESSEL EVEN.
Inventors
- 👤 Tsuneo Numata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:49
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/10; H01J23/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |