Patent US3646939A successfully refreshed from Google Patents.
US2561041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable reactance and control device comprising such a reactance
Assignee: Hartford National Bank and Trust Co
•
Filing: 1948-10-22
•
Granted: 1951-07-17
•
Expires: 1968-10-22
Abstract
No abstract record available.
Inventors
- 👤 Arends Jacobus Ludovicus
- 👤 Hugenholtz Eduard Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE351686C
Cited
US1875329A
Cited
US1557725A
Cited
US1641438A
Cited
US2089987A
Cited
US2332044A
Cited
US2456463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |