US2637837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Industrial system of voltage rectification by means of rectifying tubes provided with a control grid
Assignee: Products & Licensing Corp
•
Filing: 1947-08-04
•
Granted: 1953-05-05
•
Expires: 1967-08-04
Abstract
No abstract record available.
Inventors
- 👤 Toulon Pierre Marie Gabriel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:43
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1893784A
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US2016148A
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US1937371A
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US2093197A
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US2098182A
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US2093220A
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FR782352A
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US2093222A
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US2140377A
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US2113220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |