US2585392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monopolyphase frequency converter group
Assignee: Forges et Ateliers de Constructions Electriques de Jeumont SA
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Filing: 1949-03-15
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Granted: 1952-02-12
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Expires: 1969-03-15
Abstract
No abstract record available.
Inventors
- 👤 Letrilliart Pierre
- 👤 Galzin Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:05
CPC Classifications
H; H02; H02K; H02K47/00; H02K47/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US730673A
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US1480712A
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US1712719A
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US1808435A
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US2087782A
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US2081369A
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US2306225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |