US2447564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise reducing circuits
Assignee: Zenith Electronics LLC
•
Filing: 1943-01-30
•
Granted: 1948-08-24
•
Expires: 1963-01-30
Abstract
No abstract record available.
Inventors
- 👤 Carnahan Chalon Wesley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:26
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22; H03G3/26; H03G3/28; H03G11/00; H03G11/004
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2179974A
Cited
US2078055A
Cited
US2049750A
Cited
US2076803A
Cited
US2037456A
Cited
US2096874A
Cited
US2182677A
Cited
US2152515A
Cited
US2263633A
Cited
US2261643A
Cited
US2296101A
Cited
US2262406A
Cited
US2301620A
Cited
US2316902A
Cited
US2372934A
Cited
US2370216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |