US2668501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple stage centrifugal pump
Assignee: Allis Chalmers Corp
•
Filing: 1949-10-27
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Granted: 1954-02-09
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Expires: 1969-10-27
Abstract
No abstract record available.
Inventors
- 👤 Milton W Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:52
CPC Classifications
F; F04; F04D; F04D1/00; F04D1/06; F04D1/063; F01; F01N; F01N2450/00; F01N2450/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US814902A
Cited
US1470587A
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US1859012A
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US1989349A
Cited
US2265834A
Cited
US2258416A
Cited
US2329990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |