US2603774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency coil
Assignee: Hartford National Bank and Trust Co
•
Filing: 1948-05-08
•
Granted: 1952-07-15
•
Expires: 1968-05-08
Abstract
No abstract record available.
Inventors
- 👤 Gusdorf Frederik Hendrik
- 👤 Visch Henri Marinus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:16
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169; H03H7/0184; H01; H01F; H01F21/00; H01F21/02; H01F21/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2037883A
Cited
US2144353A
Cited
GB463348A
Cited
US2177835A
Cited
US2244025A
Cited
GB479880A
Cited
US2335205A
Cited
FR887083A
Cited
US2445979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-15 | 1956-01-14 | 1956-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-15 | 1960-01-14 | 1960-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-15 | 1964-01-14 | 1964-07-15 | $7700.00 | Window Closed / Lapsed |