US3746916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetrons
Assignee: Hitachi Ltd
•
Filing: 1972-04-26
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Granted: 1973-07-17
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Expires: 1992-04-26
Abstract
Abstract In a magnetron of the type wherein an annular anode electrode and a cathode electrode are contained in an interaction space in an evacuated envelope and magnetic flux acting upon the interaction space is produced by a magnet positioned on the outside of the envelope, first and second sealing members are sealed to the opposite ends of the anode electrode to define the evacuated envelope, a first magnet is disposed coaxially with the anode electrode substantially in contact with the outer surface of the first sealing member and a second magnet is disposed coaxially with the anode electrode substantially in contact with the outer surface of the second sealing member.
Inventors
- 👤 T Oguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
179 words
A magnetron assembly comprising an evacuated discharge device having an annular anode electrode including a plurality of inwardly projecting vanes, a cathoDe electrode disposed concentrically with said anode electrode, a first nonmagnetic thin-wall sealing member sealed to one end of said anode electrode, a second nonmagnetic thin-wall sealing member sealed to the other end of said anode electrode, said anode electrode and said first and second sealing members cooperating to define an evacuated envelope with said thin-wall sealing members opposed and closely spaced to the axial ends of the interaction space between said anode and cathode electrodes; a first magnet disposed coaxially with said anode electrode with a first surface substantially in contact with the outer surface of said first sealing member; a second magnet disposed coaxially with said anode electrode with a first surface substantially in contact with the outer surface of said second sealing member; and a ferromagnetic yoke extending from the opposite surfaces of said first and second magnets to support said assembly and provide a closed return magnetic circuit for said first and second magnets.
Claim 2
Dependent Claim
179 words
A magnetron assembly comprising an evacuated discharge device having an annular anode electrode including a plurality of inwardly projecting vanes, a cathoDe electrode disposed concentrically with said anode electrode, a first nonmagnetic thin-wall sealing member sealed to one end of said anode electrode, a second nonmagnetic thin-wall sealing member sealed to the other end of said anode electrode, said anode electrode and said first and second sealing members cooperating to define an evacuated envelope with said thin-wall sealing members opposed and closely spaced to the axial ends of the interaction space between said anode and cathode electrodes; a first magnet disposed coaxially with said anode electrode with a first surface substantially in contact with the outer surface of said first sealing member; a second magnet disposed coaxially with said anode electrode with a first surface substantially in contact with the outer surface of said second sealing member; and a ferromagnetic yoke extending from the opposite surfaces of said first and second magnets to support said assembly and provide a closed return magnetic circuit for said first and second magnets.
Claim 3
Dependent Claim
39 words
The magnetron according to claim 1 wherein said first sealing member is provided at its center a cylinder extending coaxially with said anode electrode and said cathode electrode is supported by a cathode support axially extending through said cylinder.
Claim 4
Dependent Claim
42 words
The magnetron according to claim 1 wherein said first sealing member is provided with a cylinder laterally extending from the side surface of said first sealing member and said cathode electrode is supported by a cathode support axially extending through said cylinder.
Claim 5
Dependent Claim
24 words
The magnetron according to claim 2 wherein said first magnet takes the form of a toroid encircling said cylinder of said first sealing member.
Claim 6
Dependent Claim
37 words
The magnetron according to claim 1 wherein said second sealing member is provided with a metal tube for deriving the output of said magnetron on the bottom surface thereof at a position remote from the axial center.
Claim 7
Dependent Claim
33 words
The magnetron according to claim 1 wherein said anode electrode is provided with a metal tube extending through the side wall of said anode electrode for deriving out the output of said magnetron.
Claim 8
Dependent Claim
33 words
The magnetron according to claim 6 wherein the bottom of the second sealing member is depressed inwardly of said envelope and said second magnet is placed in said depressed bottom in contact therewith.
Claim 9
Dependent Claim
22 words
The magnetron according to claim 1 wherein both said first magnet and said second magnet are in the form of a cylinder.
References Cited (Backward Citations)
US2428888A
Cited
US3315121A
Cited
US3229152A
Cited
US3465201A
Cited
US3562579A
Cited
US3588589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |