Patent US2686261A successfully refreshed from Google Patents.
US2686261A
Expired / Lapsed
US
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Polyphase frequency conversion system
Assignee: PRODUCTS AND LICENSING Corp
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Filing: 1951-01-31
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Granted: 1954-08-10
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Expires: 1971-01-31
Abstract
No abstract record available.
Inventors
- 👤 Pierre M G Toulon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:17
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02M; H02M5/00; H02M5/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1937372A
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US2105870A
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US2302893A
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US2405239A
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US2510129A
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US2447133A
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US2484034A
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US2488297A
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US2519030A
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US2442258A
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US2489262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |