US4568242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling fan for automobiles
Assignee: Denso Corp
•
Filing: 1984-10-26
•
Granted: 1986-02-04
•
Expires: 2004-10-26
Abstract
Abstract A cooling fan for automobiles which is drivable by an electric motor includes a plurality of blades, each having distal and proximal ends inclined at attachment angles larger than an attachment angle at which an intermediate portion of the blade is inclined, thereby reducing noises produced by the cooling fan.
Inventors
- 👤 Sumio Susa
- 👤 Hideaki Okamoto
- 👤 Nobuo Mitsuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:47
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/384
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
In an automobile having a radiator, a shroud adjacent to said radiator, and a fan rotatably supported within an area surrounded by said shroud, said fan comprising: a boss; and a plurality of relatively rigid blades, each connected to said boss and extending therefrom radially outwardly, the cross-sectional configuration of each blade being substantially analogous over its entire radial length, and the attachment angles of each of said blades at its distal and proximal ends being larger than that at an average-diameter portion of said blade, the attachment angle of said proximal end being at least 1.4 times larger than that of said average diameter portion.
Claim 2
Dependent Claim
106 words
In an automobile having a radiator, a shroud adjacent to said radiator, and a fan rotatably supported within an area surrounded by said shroud, said fan comprising: a boss; and a plurality of relatively rigid blades, each connected to said boss and extending therefrom radially outwardly, the cross-sectional configuration of each blade being substantially analogous over its entire radial length, and the attachment angles of each of said blades at its distal and proximal ends being larger than that at an average-diameter portion of said blade, the attachment angle of said proximal end being at least 1.4 times larger than that of said average diameter portion.
Claim 3
Dependent Claim
28 words
In a cooling fan according to claim 1, said attachment angle at said distal end is larger than that at said average-diameter portion by less than five times.
Claim 4
Dependent Claim
27 words
In a cooling fan according to claim 1, said attachment angle at said distal end is 1.5 to 3.5 times larger than that at said average-diameter portion.
References Cited (Backward Citations)
US958599A
Cited
FR735817A
Cited
US2008957A
Cited
US2116054A
Cited
DE2144600A1
Cited
US3914068A
Cited
DE2650433A1
Cited
US4180024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |