US4411598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid propeller fan
Assignee: Nissan Motor Co Ltd
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Filing: 1980-12-03
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Granted: 1983-10-25
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Expires: 2000-12-03
Abstract
Abstract A fluid propeller fan useful as but not limited to an air-circulating cooling fan for an automotive engine, wherein each of the vanes of the fan has a pitch angle which is gradually reduced from the tip or an intermediate portion toward the radially innermost end of the vane so as to provide an increased draught volume and improved draught flow characteristics.
Inventors
- 👤 Makoto Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:10
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/02; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/384; Y; Y10; Y10S; Y10S416/00; Y10S416/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A fluid propeller fan including a fan wheel rotor assembly which comprises: a wheel hub having an axis therethrough and rotatable about the axis; and a plurality of vanes extending radially outwardly from said wheel hub and angularly spaced apart from each other about said axis of the wheel hub, each of the fan vanes having a predetermined pitch angle with respect to a plane perpendicular to said axis of said wheel hub; wherein each of said vanes is provided with a radially outer longitudinal portion having, with respect to said plane, a pitch angle which is substantially constant throughout the length of said portion and a radially inner longitudinal portion having, with respect to said plane, a pitch angle which gradually decreases toward said wheel hub from said radially outer longitudinal portion.
Claim 2
Dependent Claim
133 words
A fluid propeller fan including a fan wheel rotor assembly which comprises: a wheel hub having an axis therethrough and rotatable about the axis; and a plurality of vanes extending radially outwardly from said wheel hub and angularly spaced apart from each other about said axis of the wheel hub, each of the fan vanes having a predetermined pitch angle with respect to a plane perpendicular to said axis of said wheel hub; wherein each of said vanes is provided with a radially outer longitudinal portion having, with respect to said plane, a pitch angle which is substantially constant throughout the length of said portion and a radially inner longitudinal portion having, with respect to said plane, a pitch angle which gradually decreases toward said wheel hub from said radially outer longitudinal portion.
References Cited (Backward Citations)
US1825184A
Cited
US2116055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |