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US2931943A
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Magnetron with variable resonance frequency
Assignee: JAKOBSBERGS ELEKTROTEKNISKA FA
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Filing: 1955-08-30
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Granted: 1960-04-05
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Expires: 1975-08-30
Abstract
No abstract record available.
Inventors
- 👤 Backmark Nils Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:50
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/30; H03C3/32; B; B23; B23K; B23K11/00; B23K11/30; B23K11/3009; H01; H01J; H01J23/00; H01J23/16; H01J23/18; H01J23/20; H01J23/213; H01J25/00; H01J25/50; H01J25/52; H01J25/58; H01J25/587
Claims Analysis
Total Claims: 0
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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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |