Patent US2557739A successfully refreshed from Google Patents.
US2557739A
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Apparatus for controlling the timing of periodically actuated switches of mechanicalcurrent converters
Assignee: BBC Brown Boveri AG Germany
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Filing: 1946-04-23
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Granted: 1951-06-19
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Expires: 1966-04-23
Abstract
No abstract record available.
Inventors
- 👤 Goldstein Alexander
- 👤 Blatter Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:36
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; H02M1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1529341A
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US2276784A
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US2169560A
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US2181152A
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US2188361A
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US2279729A
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US2293296A
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US2465682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |