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US2730670A
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Means for producing low-frequency electrical oscillations
Assignee: ABB Norden Holding AB
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Filing: 1950-11-07
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Granted: 1956-01-10
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Expires: 1970-11-07
Abstract
No abstract record available.
Inventors
- 👤 Borg Lennart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:48
CPC Classifications
H; H02; H02M; H02M5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1979296A
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US1913331A
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US2034787A
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US2096867A
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US2222048A
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US2567383A
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US2466018A
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US2528446A
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US2547027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |