Patent US2951216A successfully refreshed from Google Patents.
US2951216A
Expired / Lapsed
US
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Reflectionless microwave filter
Assignee: Raytheon Co
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Filing: 1956-12-17
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Granted: 1960-08-30
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Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 Conrad E Nelson
- 👤 Walter L Whirry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:34
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/217; H01P1/213; H01P1/2138
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR980648A
Cited
US2626990A
Cited
US2586993A
Cited
US2645758A
Cited
US2671884A
Cited
FR64170E
Cited
US2825765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |