Patent US2520955A successfully refreshed from Google Patents.
US2520955A
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Trapezoidal cavity magnetron
Assignee: Westinghouse Electric Corp
•
Filing: 1942-10-15
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Granted: 1950-09-05
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Expires: 1962-10-15
Abstract
No abstract record available.
Inventors
- 👤 Ernest C Okress
- 👤 Ilia E Mouromtseff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:31
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/165; H01J19/00; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR527131A
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US1547836A
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US1666833A
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US2063342A
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US2167201A
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GB509102A
Cited
CH215600A
Cited
US2270777A
Cited
US2295396A
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US2304186A
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US2247077A
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US2408235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |