Patent US2573249A successfully refreshed from Google Patents.
US2573249A
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Saturable reactor impedance relay
Assignee: ABB Norden Holding AB
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Filing: 1947-08-23
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Granted: 1951-10-30
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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 12:34
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1774944A
Cited
US1715684A
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DE566232C
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US2013815A
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US2067143A
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US2157006A
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US2149092A
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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 |