Patent US4833367A successfully refreshed from Google Patents.
US4833367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron with resonant choke structure for supressing unwanted harmonics
Assignee: Hitachi Ltd
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Filing: 1987-11-12
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Granted: 1989-05-23
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Expires: 2007-11-12
Abstract
Abstract A magnetron comprises an anode cylinder, vanes extending radially and inwardly from the anode cylinder, an output-side-sealing metal cylinder sealed to the end of the anode cylinder, an antenna lead connected to one of said vanes and a plurality of flanged metal cylinders enclosing the antenna lead and disposed inside the output-side-sealing metal cylinder along the direction of a magnetron tube axis.
Inventors
- 👤 Akikazu Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:22
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H01; H01J; H01J23/00; H01J23/36; H01J23/54; H01J23/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A magnetron comprising an anode cylinder, vanes extending radially and inwardly from said anode cylinder, an output-side-sealing metal cylinder sealed to the end of said anode cylinder, an antenna lead connected to one of said vanes, and a plurality of flanged metal cylinders enclosing said antenna lead and disposed in axially spaced relationship inside said output-side sealing metal cylinder so as to define a plurality of non coaxial and axially spaced spaces along the direction of a magnetron tube axis whereby the spaces enclosed by said output-side-sealing cylinder and said respective flanged cylinders are resonant with a wavelength to be suppressed.
Claim 2
Dependent Claim
101 words
A magnetron comprising an anode cylinder, vanes extending radially and inwardly from said anode cylinder, an output-side-sealing metal cylinder sealed to the end of said anode cylinder, an antenna lead connected to one of said vanes, and a plurality of flanged metal cylinders enclosing said antenna lead and disposed in axially spaced relationship inside said output-side sealing metal cylinder so as to define a plurality of non coaxial and axially spaced spaces along the direction of a magnetron tube axis whereby the spaces enclosed by said output-side-sealing cylinder and said respective flanged cylinders are resonant with a wavelength to be suppressed.
Claim 3
Dependent Claim
117 words
A magnetron comprising an anode cylinder, vanes extending radially and inwardly from said anode cylinder, an output-side-sealing metal cylinder sealed to the end of said anode cylinder to form an evacuated envelope in combination with said anode cylinder, an antenna lead connected to one of said vanes, said output-side sealing metal cylinder comprising a plurality of sub-cylinders stacked along the direction of the axis of the magnetron tube axis and hermetically sealed by brazing the end of a cylinder portion of said sub-cylinders on an adjacent sub-cylinder to form a plurality of spaces enclosed by said adjacent sub-cylinders, said space being disposed moncoaxially and in axially spaced and non-overlapping relationship and resonant with wavelengths to be suppressed.
Claim 4
Dependent Claim
117 words
A magnetron comprising an anode cylinder, vanes extending radially and inwardly from said anode cylinder, an output-side-sealing metal cylinder sealed to the end of said anode cylinder to form an evacuated envelope in combination with said anode cylinder, an antenna lead connected to one of said vanes, said output-side sealing metal cylinder comprising a plurality of sub-cylinders stacked along the direction of the axis of the magnetron tube axis and hermetically sealed by brazing the end of a cylinder portion of said sub-cylinders on an adjacent sub-cylinder to form a plurality of spaces enclosed by said adjacent sub-cylinders, said space being disposed moncoaxially and in axially spaced and non-overlapping relationship and resonant with wavelengths to be suppressed.
Claim 5
Dependent Claim
17 words
A magnetron according to claim 1 wherein all of said spaces are resonant with the same wavelength.
Claim 6
Dependent Claim
18 words
A magnetron according to claim 1 wherein at least two of said spaces are resonant with different wavelengths.
Claim 7
Dependent Claim
14 words
A magnetron according to claim 2 wherein sub-cylinders are formed with a stepped portion.
Claim 8
Dependent Claim
23 words
A magnetron according to claim 5 wherein said stepped portion is inserted into the end of a cylinder portion of said adjacent sub-cylinder.
Claim 9
Dependent Claim
17 words
A magnetron according to claim 2 wherein said sub-cylinders are formed with a plurality of stepped portions.
Claim 10
Dependent Claim
17 words
A magnetron according to claim 2 wherein all of said spaces are resonant with the same wavelength.
Claim 11
Dependent Claim
18 words
A magnetron acdording to claim 2 wherein at least two of said spaces are resonant with different wavelengths.
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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |