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US2828461A
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Contact transformer with two parallel contact systems
Assignee: Siemens Schuckertwerke AG
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Filing: 1954-12-23
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Granted: 1958-03-25
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Expires: 1974-12-23
Abstract
No abstract record available.
Inventors
- 👤 Pokorny Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:27
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; H02M1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1654937A
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US1661841A
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US2137098A
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US2181152A
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US2199121A
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US2340098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |