US4164684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetrons
Assignee: Hitachi Ltd
•
Filing: 1977-12-30
•
Granted: 1979-08-14
•
Expires: 1997-12-30
Abstract
Abstract A cylindrical envelope of the magnetron is provided with annular grooves about its periphery and each of the cooling fins and the mounting plate is provided with an annular member press fitted on the envelope and an integral bent rim which engages the groove.
Inventors
- 👤 Tomokatsu Oguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:42
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
In a magnetron of the type comprising a cylindrical main body containing anode and cathode electrodes and permanent magnets, and component parts mounted on the periphery of said main body, the improvement wherein each of said component parts is provided with an annular member press fitted on said main body and having an inner diameter equal to or a little smaller than the outer diameter of said main body and said main body is provided with at least one, annular, circumferential groove around the outer periphery thereof for engagement with a portion of said annular member.
Claim 2
Dependent Claim
96 words
In a magnetron of the type comprising a cylindrical main body containing anode and cathode electrodes and permanent magnets, and component parts mounted on the periphery of said main body, the improvement wherein each of said component parts is provided with an annular member press fitted on said main body and having an inner diameter equal to or a little smaller than the outer diameter of said main body and said main body is provided with at least one, annular, circumferential groove around the outer periphery thereof for engagement with a portion of said annular member.
Claim 3
Dependent Claim
14 words
The magnetron according to claim 1 wherein said component part comprises a mounting member.
Claim 4
Dependent Claim
13 words
The magnetron according to claim 1 wherein said component part comprises cooling fins.
Claim 5
Dependent Claim
25 words
The magnetron according to claim 1 wherein said annular member is provided with a flange and an inwardly bent rim for engagement with said groove.
Claim 6
Dependent Claim
20 words
The magnetron according to claim 1 wherein a slot is provided for said groove engaging portion of said annular member.
Claim 7
Dependent Claim
20 words
The magnetron according to claim 5 wherein said groove engaging portion has a smaller width than that of said slot.
Claim 8
Dependent Claim
35 words
The magnetron according to claim 2 wherein said annular member emerges into a mounting portion of the mounting member through a cup-shaped connecting portion and extends upwardly to engage the upper wall of said groove.
References Cited (Backward Citations)
US2289984A
Cited
US2431157A
Cited
US2852715A
Cited
US2849633A
Cited
US3493810A
Cited
US3967154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |