US2774920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic switch arrangement
Assignee: Fkg Fritz Kesselring Geratebau AG
•
Filing: 1951-10-04
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Granted: 1956-12-18
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Expires: 1971-10-04
Abstract
No abstract record available.
Inventors
- 👤 Kesselring Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:22
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/30; H02M7/32; H02M7/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US684378A
Cited
FR428146A
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US1644525A
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FR695501A
Cited
US2111550A
Cited
GB529396A
Cited
US2369296A
Cited
FR887127A
Cited
FR53072E
Cited
US2570062A
Cited
US2617974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |