US2760169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave filters
Assignee: TDK Micronas GmbH
•
Filing: 1951-08-01
•
Granted: 1956-08-21
•
Expires: 1971-08-01
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Engelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/081; H01P1/00; H01P1/10; H01P1/12; H01P1/127; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20363; H01P1/2039; H01P5/00; H01P5/08; H01P5/12; H01Q; H01Q13/00; H01Q13/20; H01Q13/26
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |