US2544152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency coil system
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-04-12
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Granted: 1951-03-06
•
Expires: 1966-04-12
Abstract
No abstract record available.
Inventors
- 👤 Gusdorf Frederik Hendrik
- 👤 Veenis Cornelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:52
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169; H03H7/0184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2165467A
Cited
GB463348A
Cited
US2180413A
Cited
GB479880A
Cited
US2283925A
Cited
US2158255A
Cited
US2407916A
Cited
US2435630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |