US2452499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifying circuit arrangement
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-10-18
•
Granted: 1948-10-26
•
Expires: 1966-10-18
Abstract
No abstract record available.
Inventors
- 👤 Siezen Gerrit Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:42
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/04; H03G5/06; H03G5/08; H03F; H03F1/00; H03F1/34; H03F1/36; H03F3/00; H03F3/20; H03F3/22; H04; H04R; H04R3/00; H04R3/12; H04R3/14; H04R5/00; H04R5/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |