Patent US2574631A successfully refreshed from Google Patents.
US2574631A
Expired / Lapsed
US
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Constant pressure centrifugal pump
Assignee: Individual
•
Filing: 1950-04-28
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Granted: 1951-11-13
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Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
- 👤 Ely George William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/0027; F04D15/0038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1694805A
Cited
US1853430A
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US2037894A
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FR883727A
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US2343752A
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US2470565A
Cited
GB599961A
Cited
US2455552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |