Patent US3448379A successfully refreshed from Google Patents.
US3448379A
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US
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Dielectric cavity resonator
Assignee: McDonnell Douglas Corp
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Filing: 1964-05-18
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Granted: 1969-06-03
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Expires: 1984-05-18
Abstract
No abstract record available.
Inventors
- 👤 Fred J Rosenbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:56
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2704830A
Cited
US2838736A
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US2813251A
Cited
US3165705A
Cited
US3271667A
Cited
US3267360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |