Patent US2522035A successfully refreshed from Google Patents.
US2522035A
Expired / Lapsed
US
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Device for controlling the coupling between two inductively coupled circuits
Assignee: Hartford National Bank and Trust Co
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Filing: 1946-07-20
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Granted: 1950-09-12
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Expires: 1966-07-20
Abstract
No abstract record available.
Inventors
- 👤 Gusdorf Frederik Hendrik
- 👤 Ewoud Adriaan Van Yzeren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:21
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/02; H01F21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2111373A
Cited
US2206096A
Cited
US2187340A
Cited
US2282386A
Cited
US2285128A
Cited
US2389986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |