Ducted fan
USRE34551E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | May 21, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | May 21, 2012 |
Classification
- Technology area (CPC —)General
Abstract
A ducted fan including a funnel-shaped duct positioned upstream of the impeller and connected to a base, an outer cowling concentrically positioned downstream and attached to said duct through a series of ribs, an inner cowling positioned inside the outer cowling and surrounding the impeller and a circular grill attached to the discharge end of the inner cowling. The grill including a center hub and a series of arcuate-shaped ribs extending outwardly from the hub and having a constant curvature of less diameter than the outside radius of the grill whereby the maximum lateral spacing between the ribs is at a radius inboard from the outside radius of the grill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.