US1784546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling and indicating earth leakages in alternatingcurrent lines
Assignee: Siemens and Halske AG
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Filing: 1925-11-28
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Granted: 1930-12-09
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Expires: 1945-11-28
Abstract
No abstract record available.
Inventors
- 👤 Schleicher Manfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-12-08 | 1934-06-09 | 1934-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-12-08 | 1938-06-09 | 1938-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-12-08 | 1942-06-09 | 1942-12-09 | $7700.00 | Window Closed / Lapsed |