Patent US2920281A successfully refreshed from Google Patents.
US2920281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppressor
Assignee: LENKURT ELECTRIC CO Inc
•
Filing: 1954-04-27
•
Granted: 1960-01-05
•
Expires: 1974-04-27
Abstract
No abstract record available.
Inventors
- 👤 Kurt E Appert
- 👤 Lennart G Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:22
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/002; H04; H04B; H04B3/00; H04B3/02; H04B3/20; H04M; H04M1/00; H04M1/738; H04M1/74
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1481284A
Cited
US1689318A
Cited
US1901929A
Cited
US2621253A
Cited
US2438217A
Cited
US2622150A
Cited
US2737628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |