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Patent US2201947A successfully refreshed from Google Patents.
US2201947A
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Varipitch spiral blade impeller or turbine
Assignee: Patterson Foundry & Machine Co
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Filing: 1938-03-16
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Granted: 1940-05-21
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Expires: 1958-03-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth S Valentine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:38
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/112; B01F27/1123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-05-21 | 1943-11-20 | 1944-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-21 | 1947-11-20 | 1948-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-21 | 1951-11-20 | 1952-05-21 | $7700.00 | Window Closed / Lapsed |