Patent US3284728A successfully refreshed from Google Patents.
US3284728A
Expired / Lapsed
US
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Electromechanical filter
Assignee: Siemens and Halske AG
•
Filing: 1962-09-21
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Granted: 1966-11-08
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Expires: 1982-09-21
Abstract
No abstract record available.
Inventors
- 👤 Poschenrieder Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:44
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1976481A
Cited
US2001387A
Cited
US2248776A
Cited
US2249440A
Cited
US2271200A
Cited
US2756395A
Cited
US2770782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |