US4197057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan assembly
Assignee: Aisin Corp
•
Filing: 1978-04-17
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Granted: 1980-04-08
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Expires: 1998-04-17
Abstract
Abstract The fan assembly for a motor vehicle includes a plurality of radially extending blades each having a first rearwardly facing concave curvature extending along the entire length of the blade adjacent the leading edge and a forwardly facing concave curvature at the outer end of the blade adjacent the trailing edge to increase the cooling efficiency of the fan and decrease the noise produced during operation.
Inventors
- 👤 Masaharu Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:21
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/02; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A fan assembly comprising a central boss member and a plurality of non-overlapping blades connected to and extending straight radially outwardly from said boss member, each of said blades having an upstream side, a downstream side, a leading edge and a trailing edge said edges of the blade being disposed parallel to each other, the root portion of the blade having only a single radius of curvature located on the downstream side of said blade and the radially outer portion of the blade having a reversely curved portion adjacent the trailing edge of said blade with a radius of curvature positioned on the upstream side of said blade; the inflection line between said oppositely directed curvatures being disposed at an acute angle relative to the radius of said blade extending outwardly from said boss member and extending from a point adjacent the trailing edge of the blade at the midpoint thereof outwardly to the outer edge of the blade.
Claim 2
Dependent Claim
159 words
A fan assembly comprising a central boss member and a plurality of non-overlapping blades connected to and extending straight radially outwardly from said boss member, each of said blades having an upstream side, a downstream side, a leading edge and a trailing edge said edges of the blade being disposed parallel to each other, the root portion of the blade having only a single radius of curvature located on the downstream side of said blade and the radially outer portion of the blade having a reversely curved portion adjacent the trailing edge of said blade with a radius of curvature positioned on the upstream side of said blade; the inflection line between said oppositely directed curvatures being disposed at an acute angle relative to the radius of said blade extending outwardly from said boss member and extending from a point adjacent the trailing edge of the blade at the midpoint thereof outwardly to the outer edge of the blade.
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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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |