Patent US2661938A successfully refreshed from Google Patents.
US2661938A
Expired / Lapsed
US
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Electromagnetic stirrer for highpressure contactors
Assignee: Standard Oil Co
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Filing: 1950-06-30
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Granted: 1953-12-08
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Expires: 1970-06-30
Abstract
No abstract record available.
Inventors
- 👤 Ward E Kuentzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:01
CPC Classifications
B; B01; B01F; B01F31/00; B01F31/44; B01F31/441; B01F33/00; B01F33/45; B01F33/70; B01F33/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US469411A
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US2456846A
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US1128036A
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US1096989A
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US1862089A
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US2094357A
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US2223348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |