US3197124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump impellers
Assignee: Individual
•
Filing: 1962-04-03
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Granted: 1965-07-27
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Expires: 1982-04-03
Abstract
No abstract record available.
Inventors
- 👤 Sallou Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:04
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/288; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/442
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
IN A CENTRIFUGAL FAN, A RADIAL FLOW IMPELLER INCLUDING IMPELLER BLADES ADAPTED FOR ROTATION ABOUT A PREDETERMINED AXIS, ANNULAR PLATE MEANS SECURED ON OPPOSITE SIDES OF THE CIRCUMFERENTIAL DISCHARGE OF SAID IMPELLER AND EXTENDING RADIALLY THEREOF FOR DECELERATING THE FLUID PASSING THERETHROUGH, ELONGATED AUXILIARY BLADE MEANS HAVING THE CENTRAL LONGITUDINAL AXES THEREOF RESPECTIVELY PARALLEL TO SUCH PREDETERMINED AXIS, SAID BLADE MEANS HAVING THE ENDS THEREOF SECURED TO SAID DECELERATING MEANS AND LOCATED IN THE FLOW PATH OF SUCH FLUID RADIALLY OUTWARDLY FROM THE TERMINAL EDGE OF SAID IMPELLER BLADES, THE NUMBER (N) OF SAID AUXILIARY BLADE MEANS AND THE CHORDAL LENGTHS (L) THEREOF RESPECTIVELY ARE RELATED BY THE FOLLOWING EQUATION: NXL=.35XC WHEREIN THE CONSTANT .35 IS THE PERCENT REDUCTION OF PERIPHERAL FLOW AREA DUE TO THE BLADES AND PERMITTED TO HAVE A MAXIMUM VALUE OF 0.4; AND C IS THE CIRCUMFERENCE OF THE IMPELLER TAKEN ALONG A CIRCLE PASSING THROUGH THE LONGITUDINAL AXES OF THE AUXILIARY BLADES.
Claim 2
Dependent Claim
157 words
IN A CENTRIFUGAL FAN, A RADIAL FLOW IMPELLER INCLUDING IMPELLER BLADES ADAPTED FOR ROTATION ABOUT A PREDETERMINED AXIS, ANNULAR PLATE MEANS SECURED ON OPPOSITE SIDES OF THE CIRCUMFERENTIAL DISCHARGE OF SAID IMPELLER AND EXTENDING RADIALLY THEREOF FOR DECELERATING THE FLUID PASSING THERETHROUGH, ELONGATED AUXILIARY BLADE MEANS HAVING THE CENTRAL LONGITUDINAL AXES THEREOF RESPECTIVELY PARALLEL TO SUCH PREDETERMINED AXIS, SAID BLADE MEANS HAVING THE ENDS THEREOF SECURED TO SAID DECELERATING MEANS AND LOCATED IN THE FLOW PATH OF SUCH FLUID RADIALLY OUTWARDLY FROM THE TERMINAL EDGE OF SAID IMPELLER BLADES, THE NUMBER (N) OF SAID AUXILIARY BLADE MEANS AND THE CHORDAL LENGTHS (L) THEREOF RESPECTIVELY ARE RELATED BY THE FOLLOWING EQUATION: NXL=.35XC WHEREIN THE CONSTANT .35 IS THE PERCENT REDUCTION OF PERIPHERAL FLOW AREA DUE TO THE BLADES AND PERMITTED TO HAVE A MAXIMUM VALUE OF 0.4; AND C IS THE CIRCUMFERENCE OF THE IMPELLER TAKEN ALONG A CIRCLE PASSING THROUGH THE LONGITUDINAL AXES OF THE AUXILIARY BLADES.
References Cited (Backward Citations)
GB190327286A
Cited
FR343288A
Cited
US1029554A
Cited
GB180299A
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GB464449A
Cited
US2294221A
Cited
US2681760A
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FR1066912A
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GB733533A
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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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |