US2672584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diferential apparatus for the protection of current converters
Assignee: Siemens Schuckertwerke AG
•
Filing: 1951-10-20
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Granted: 1954-03-16
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Expires: 1971-10-20
Abstract
No abstract record available.
Inventors
- 👤 Rolf Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:19
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1792099A
Cited
US1863162A
Cited
US1817084A
Cited
US2008511A
Cited
US2510616A
Cited
US2434214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |