US4826401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: Tmt Research Development Inc
•
Filing: 1981-07-02
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Granted: 1989-05-02
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Expires: 2001-07-02
Abstract
Abstract Centrifugal pump adapted for pumping finely particulate slurries, comprising a steel housing having an inlet and an outlet and a volute therebetween, a motor mounted on the housing, and an impeller rotatably driven within the volute by the motor for pumping fluid through the housing along a flow path extending through the volute and between the inlet and outlet, the pump having surfaces conditioned against erosive wear along the flow path comprising iron carbide and iron boride formed in situ locally at pump steel surfaces subject to erosive wear.
Inventors
- 👤 Eugene V. Clark
- 👤 George K. Sievers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/78; F; F04; F04D; F04D29/00; F04D29/02; F04D29/026; F04D7/00; F04D7/02; F04D7/04; F05; F05D; F05D2230/00; F05D2230/90; F05D2300/00; F05D2300/10; F05D2300/17; F05D2300/171; F05D2300/20; F05D2300/22; F05D2300/226
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
Centrifugal pump adapted for pumping finely particulate slurries, comprising a steel housing having an inlet and an outlet and a volute therebetween, a motor mounted on said housing, and an impeller rotatably driven within said volute by said motor for pumping fluid through said housing along a flow path extending through said volute and between inlet and outlet, said pump having conditioned surfaces conditioned against erosive wear along said flow path comprising iron carbide, iron boride and iron nitride formed in situ locally at pump steel surfaces subject to erosive wear.
Claim 2
Dependent Claim
91 words
Centrifugal pump adapted for pumping finely particulate slurries, comprising a steel housing having an inlet and an outlet and a volute therebetween, a motor mounted on said housing, and an impeller rotatably driven within said volute by said motor for pumping fluid through said housing along a flow path extending through said volute and between inlet and outlet, said pump having conditioned surfaces conditioned against erosive wear along said flow path comprising iron carbide, iron boride and iron nitride formed in situ locally at pump steel surfaces subject to erosive wear.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |