US2440947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump with impeller supporting wear rings
Assignee: AO Smith Corp
•
Filing: 1945-01-11
•
Granted: 1948-05-04
•
Expires: 1965-01-11
Abstract
No abstract record available.
Inventors
- 👤 Hart Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:01
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/165; F04D29/167
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE505539C
Cited
US1163809A
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US1463248A
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US1667992A
Cited
GB325137A
Cited
US1974183A
Cited
US1909410A
Cited
US1974678A
Cited
US2116397A
Cited
US2332614A
Cited
US2368962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |