US2651750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical rectifier
Assignee: Licentia Patent Verwaltungs GmbH
•
Filing: 1951-02-14
•
Granted: 1953-09-08
•
Expires: 1971-02-14
Abstract
No abstract record available.
Inventors
- 👤 Koppelmann Floris
- 👤 Bohm Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:15
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; H02M1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2116899A
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US2227937A
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US2195818A
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US2188361A
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US2225644A
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FR851731A
Cited
DE712446C
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US2247361A
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US2340098A
Cited
FR881582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |