Patent US3389351A successfully refreshed from Google Patents.
US3389351A
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US
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Unsymmetrical electromechanical filters
Assignee: VEB WERK fur BAUELEMENTE DER NACHRICHTENTECHNIK "CARL VON OSSIETZKY"
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Filing: 1965-10-07
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Granted: 1968-06-18
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Expires: 1985-10-07
Abstract
No abstract record available.
Inventors
- 👤 Trzeba Erich
- 👤 Rudloff Hans Hermann
- 👤 Deliga Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:44
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2617882A
Cited
US2918634A
Cited
US2856588A
Cited
US3013228A
Cited
DE1147335B
Cited
FR1358314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |