US2610231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous electric current switching apparatus
Assignee: Fkg Fritz Kesselring Geratebau AG
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Filing: 1950-09-07
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Granted: 1952-09-09
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Expires: 1970-09-07
Abstract
No abstract record available.
Inventors
- 👤 Wettstein Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:22
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1183882A
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US1374534A
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US1265354A
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US2293296A
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US2285691A
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US2375609A
Cited
US2465682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |