Patent US2290553A successfully refreshed from Google Patents.
US2290553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative feedback circuit arrangement
Assignee: Individual
•
Filing: 1941-01-11
•
Granted: 1942-07-21
•
Expires: 1961-01-11
Abstract
No abstract record available.
Inventors
- 👤 Haantjes Johan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H03C; H03C1/00; H03C1/02; H03C1/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-07-20 | 1946-01-19 | 1946-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-20 | 1950-01-19 | 1950-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-20 | 1954-01-19 | 1954-07-21 | $7700.00 | Window Closed / Lapsed |