Patent US2581055A successfully refreshed from Google Patents.
US2581055A
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Centrifugal pump
Assignee: W H MARTIN
•
Filing: 1946-09-03
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Granted: 1952-01-01
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Expires: 1966-09-03
Abstract
No abstract record available.
Inventors
- 👤 Wahle Adolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:56
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/445; F04D29/18; F04D29/22; F04D29/2205; F04D29/2211
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US346471A
Cited
US607133A
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GB191128980A
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US1295621A
Cited
US1543740A
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US1573973A
Cited
US2293590A
Cited
US2393127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |