US4066928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant cavity magnetron having a helical cathode
Assignee: US Philips Corp
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Filing: 1976-04-30
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Granted: 1978-01-03
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Expires: 1996-04-30
Abstract
Abstract Each of the ends of a helical cathode for a magnetron are connected to the respective end plate and supporting rod by a single collective weld.
Inventors
- 👤 Joannes Baptista Maria Adrianus Van Besouw
- 👤 Egbert Bernardus Gretinus Willem Gotje
- 👤 Franciscus Napoleon Adrianus Kerstens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:14
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
In a resonant cavity magnetron having a helical cathode having two ends being secured to two end plates which are supported by respective supporting rods, the improvement wherein each one of the two cathode ends is connected with a respective end plate and one of the associated supporting rods by a single collective weld, the cathode extending tangentially at its non-free end and being bent towards the axis at its free end.
Claim 2
Dependent Claim
72 words
In a resonant cavity magnetron having a helical cathode having two ends being secured to two end plates which are supported by respective supporting rods, the improvement wherein each one of the two cathode ends is connected with a respective end plate and one of the associated supporting rods by a single collective weld, the cathode extending tangentially at its non-free end and being bent towards the axis at its free end.
Claim 3
Dependent Claim
34 words
A resonant cavity magnetron as claimed in claim 1, wherein one of the supporting rods extends through said cathode, and the free end of the cathode encircles said one supporting rod in contacting relationship.
Claim 4
Dependent Claim
32 words
A resonant cavity magnetron as claimed in claim 1, wherein one supporting rod extends through said helical cathode, and a gettering wire is wound around said one supporting rod within the cathode.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |