US2429504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation network
Assignee: Hartford National Bank and Trust Co
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Filing: 1943-11-09
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Granted: 1947-10-21
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Expires: 1963-11-09
Abstract
No abstract record available.
Inventors
- 👤 Ziegler Marc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:29
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/18; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/14; H04B; H04B14/00; H04B14/002; H04B14/006; H04B7/00; H04B7/02; H04B7/04; H04B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-20 | 1951-04-21 | 1951-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-20 | 1955-04-21 | 1955-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-20 | 1959-04-21 | 1959-10-21 | $7700.00 | Window Closed / Lapsed |