US2490727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-current voltage amplifier
Assignee: Hartford National Bank and Trust Co
•
Filing: 1947-12-06
•
Granted: 1949-12-06
•
Expires: 1967-12-06
Abstract
No abstract record available.
Inventors
- 👤 Carpentier Edmond Egbertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:32
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1820212A
Cited
US1926568A
Cited
US2043107A
Cited
US2297543A
Cited
US2413788A
Cited
US2442298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |