US2848678A
Expired / Lapsed
US
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Electromagnetic rectifier
Assignee: Fkg Fritz Kesselring Geratebau AG
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Filing: 1952-08-02
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Granted: 1958-08-19
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Expires: 1972-08-02
Abstract
No abstract record available.
Inventors
- 👤 Kesselring Fritz
- 👤 Wettstein Erwin
- 👤 Spaelti Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:28
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/30; H02M7/32; H02M7/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |