US3832085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive fan shroud
Assignee: Ford Motor Co
•
Filing: 1972-10-04
•
Granted: 1974-08-27
•
Expires: 1992-10-04
Abstract
Abstract A shroud enclosing an automotive type fan has ridges projecting from the internal surface equally spaced circumferentially to provide a circumferentially undulating pattern to the axial flow of air forced through the space between the shroud and the fan to reduce the noise level of the shroud-fan combination.
Inventors
- 👤 Fauw R De
- 👤 R Murley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:57
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/522; F04D29/526; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
An automotive type fan shroud including a generally cylindrical section adapted to surround and axially enclose a fan and having circumferentially spaced projections from the internal surface to provide a circumferentially undulating pattern to the axial flow of air past the shroud thereby reducing fan-shroud combination noise level the fan having blades enclosed by the shroud, a radial clearance space being provided between the inner extremities of the projections and the outer radial extent of the fan blades.
Claim 2
Dependent Claim
78 words
An automotive type fan shroud including a generally cylindrical section adapted to surround and axially enclose a fan and having circumferentially spaced projections from the internal surface to provide a circumferentially undulating pattern to the axial flow of air past the shroud thereby reducing fan-shroud combination noise level the fan having blades enclosed by the shroud, a radial clearance space being provided between the inner extremities of the projections and the outer radial extent of the fan blades.
Claim 3
Dependent Claim
34 words
A fan shroud as in claim 1, the projections each having a finger like appearance oriented parallel to the shroud axis and the projections together being equally spaced circumferentially around the shroud internal surface.
Claim 4
Dependent Claim
19 words
A fan shroud as in claim 2, the projections having an axially extending taper at the air entrance end.
References Cited (Backward Citations)
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |