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Patent US2820923A successfully refreshed from Google Patents.
US2820923A
Expired / Lapsed
US
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Magnetron
Assignee: General Electric Co
•
Filing: 1952-07-25
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Granted: 1958-01-21
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Expires: 1972-07-25
Abstract
No abstract record available.
Inventors
- 👤 Donald A Wilbur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:49
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/50; H01J25/52; H01J25/54; H01J25/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1565416A
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US1889595A
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US2217745A
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US2162807A
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US2198334A
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US2227078A
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US2597506A
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US2582185A
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US2617968A
Cited
US2511407A
Cited
US2607904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |