US2726334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-selective electrical network
Assignee: Zenith Electronics LLC
•
Filing: 1951-05-23
•
Granted: 1955-12-06
•
Expires: 1971-05-23
Abstract
No abstract record available.
Inventors
- 👤 Arvid E Chelgren
- 👤 John F Bell
- 👤 Lloyd E Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:54
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H2/00; H03H2/005; H03H2/008
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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |