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US2647239A
Expired / Lapsed
US
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Passive four terminal network for gyrating a current into a voltage
Assignee: Hartford National Bank and Trust Co
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Filing: 1948-03-06
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Granted: 1953-07-28
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Expires: 1968-03-06
Abstract
No abstract record available.
Inventors
- 👤 Tellegen Bernardus Do Hubertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:32
CPC Classifications
H; H01; H01K; H01K7/00; H01K7/02; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H7/00; H03H7/002; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169; H03H7/0184
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) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |