Patent US2504218A successfully refreshed from Google Patents.
US2504218A
Expired / Lapsed
US
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Pump operating unit
Assignee: CONS WESTERN STEEL CORP
•
Filing: 1946-05-10
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Granted: 1950-04-18
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Expires: 1966-05-10
Abstract
No abstract record available.
Inventors
- 👤 Paul E Noll
- 👤 Charles W Crawford
- 👤 Aller T Dwight
- 👤 Albert R Rethey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:30
CPC Classifications
F; F04; F04B; F04B47/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1978346A
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US2072595A
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US2157219A
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US2167623A
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US2304131A
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US2390124A
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US2276358A
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US2277761A
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US2282977A
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US2357986A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |