Patent US3451014A successfully refreshed from Google Patents.
US3451014A
Expired / Lapsed
US
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Waveguide filter having branch means to absorb or attenuate frequencies above pass-band
Assignee: Microwave Development Laboratories Inc
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Filing: 1964-12-23
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Granted: 1969-06-17
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Expires: 1984-12-23
Abstract
No abstract record available.
Inventors
- 👤 Robert E Brosnahan
- 👤 Edward J Curley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:59
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/212
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2215955A
Cited
US2432093A
Cited
US2866595A
Cited
US2961619A
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US3130380A
Cited
US3187277A
Cited
US3237134A
Cited
US3353123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |