US2724075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device comprising a ferromagnetic circuit
Assignee: Hartford National Bank and Trust Co
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Filing: 1952-01-04
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Granted: 1955-11-15
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Expires: 1972-01-04
Abstract
No abstract record available.
Inventors
- 👤 Arend Thomas Van Urk
- 👤 Cluwen Johannes Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:34
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/14; H01F29/146; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0311; H01F1/0313; H01F1/0315; H01F7/00; H01F7/02; H01F7/0205
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) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |