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US2887641A
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Alternating-current systems with intermittently operating squirrel-cage motors energized from synchronous alternators
Assignee: Siemens Schuckertwerke AG
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Filing: 1956-04-06
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Granted: 1959-05-19
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Expires: 1976-04-06
Abstract
No abstract record available.
Inventors
- 👤 Scharstein Ernst
- 👤 Lutz Karlheinz
- 👤 Falkenberg Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:27
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191113099A
Cited
US1847585A
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FR834163A
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US2419268A
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US2576647A
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US2769133A
Cited
US2608679A
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US2806990A
Cited
US2783432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |