US2571802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: AR Wilfley and Sons Inc
•
Filing: 1948-04-09
•
Granted: 1951-10-16
•
Expires: 1968-04-09
Abstract
No abstract record available.
Inventors
- 👤 Elmer R Wilfley
- 👤 Jr John L Aldred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/14; F04D29/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE665421C
Cited
US1869824A
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US1756323A
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DE543889C
Cited
US2092351A
Cited
FR805897A
Cited
DE684205C
Cited
US2464853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |