Patent US2311837A successfully refreshed from Google Patents.
US3176231A
Expired / Lapsed
US
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System for cancellation of ground reflections
Assignee: TDK Micronas GmbH
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Filing: 1961-03-21
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Granted: 1965-03-30
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Expires: 1981-03-21
Abstract
No abstract record available.
Inventors
- 👤 Lucio M Vallese
- 👤 Himmel Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:08
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2152515A
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US2173156A
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US2318268A
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US2489254A
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US2744247A
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US2632101A
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US3079558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |