US3794879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave magnetron
Assignee: Raytheon Co
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Filing: 1972-10-24
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Granted: 1974-02-26
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Expires: 1992-10-24
Abstract
Abstract A crossed field electromagnetic energy device of the magnetron type is provided with integral magnetic field producing means including permanently magnetized members of a ferromagnetic material diametrically disposed adjacent to opposing sides of the anode member sidewalls together with spaced return path members. The magnetic field leakage flux is reduced by tapering the return path member walls to as close as possible to the magnet member outline. Energy leakage is controlled by eliminating axial clearance passageways for the cathode assembly found in prior art axially mounted magnet packages. A circulating fluid medium is directed between cooling fins which partially surround each magnet member and are appended to the anode member walls to control magnet material temperatures during operation and improve magnetic field efficiencies. A lighter weight device which is simple to assemble results with lower manufacturing costs as well as reduced shipping and handling costs.
Inventors
- 👤 R Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:52
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/005; H01J23/02; H01J23/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A microwave magnetron comprising: a cylindrical anode member defining a plurality of circumferentially disposed cavity resonators; a cathode having external electrical leads centrally disposed within said aNode member; means for producing a magnetic field parallel to the longitudinal axis of the anode member including permanently magnetized members of a ferromagnetic material disposed parallel to diametrically opposed sidewalls of said anode member and contacting spaced rectangular return path plate members; said plate members having tapered corner walls substantially longer than the remaining straight narrow sides; and a plurality of cooling fin members contacting the sidewalls of said anode member and partially surrounding said magnet members.
Claim 2
Dependent Claim
104 words
A microwave magnetron comprising: a cylindrical anode member defining a plurality of circumferentially disposed cavity resonators; a cathode having external electrical leads centrally disposed within said aNode member; means for producing a magnetic field parallel to the longitudinal axis of the anode member including permanently magnetized members of a ferromagnetic material disposed parallel to diametrically opposed sidewalls of said anode member and contacting spaced rectangular return path plate members; said plate members having tapered corner walls substantially longer than the remaining straight narrow sides; and a plurality of cooling fin members contacting the sidewalls of said anode member and partially surrounding said magnet members.
Claim 3
Dependent Claim
119 words
A microwave heating apparatus comprising: conductive wall structure defining an enclosure; a source of microwave electromagnetic energy; means for coupling said energy from said source to energize said enclosure; said microwave source comprising an anode member, central cathode with external electrical leads, permanent magnet members disposed parallel to diametrically opposing sidewalls of said anode member and spaced rectangular return path plate members contacting opposing ends of said magnet members; said plate members having tapered corner walls substantially longer than the remaining straight narrow sides; and means for cooling said microwave source comprising a plurality of spaced conductive fin members appended to the anode member sidewalls and partially surrounding said magnet members for directing the flow of a fluid medium.
Claim 4
Dependent Claim
119 words
A microwave heating apparatus comprising: conductive wall structure defining an enclosure; a source of microwave electromagnetic energy; means for coupling said energy from said source to energize said enclosure; said microwave source comprising an anode member, central cathode with external electrical leads, permanent magnet members disposed parallel to diametrically opposing sidewalls of said anode member and spaced rectangular return path plate members contacting opposing ends of said magnet members; said plate members having tapered corner walls substantially longer than the remaining straight narrow sides; and means for cooling said microwave source comprising a plurality of spaced conductive fin members appended to the anode member sidewalls and partially surrounding said magnet members for directing the flow of a fluid medium.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |