US2466440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller for rotary pumps
Assignee: Individual
•
Filing: 1948-07-29
•
Granted: 1949-04-05
•
Expires: 1968-07-29
Abstract
No abstract record available.
Inventors
- 👤 Kiekhaefer Elmer Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:57
CPC Classifications
F; F04; F04C; F04C5/00; F03; F03C; F03C2/00; F03C2/30; F04C2/00; F04C2/30; F04C2/40; F04C2/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190809771A
Cited
GB344118A
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US2004712A
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FR736262A
Cited
US2070738A
Cited
GB464475A
Cited
US2246488A
Cited
US2297619A
Cited
US2272900A
Cited
US2293268A
Cited
US2460617A
Cited
US2460952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-04 | 1952-10-04 | 1953-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-04 | 1956-10-04 | 1957-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-04 | 1960-10-04 | 1961-04-05 | $7700.00 | Window Closed / Lapsed |