Patent US2326963A successfully refreshed from Google Patents.
US2573249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saturable reactor impedance relay
Assignee: ABB Norden Holding AB
•
Filing: 1947-08-23
•
Granted: 1951-10-30
•
Expires: 1967-08-23
Abstract
No abstract record available.
Inventors
- 👤 Dahlgren Fredrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:37
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1774944A
Cited
US1715684A
Cited
DE566232C
Cited
US2013815A
Cited
US2067143A
Cited
US2157006A
Cited
US2149092A
Cited
USRE22768E
Cited
US2381527A
Cited
US2352985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |