The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2001
Filed:
Dec. 06, 1999
Detlef W. Schmidt, Schaumburg, IL (US);
Garron K. Morris, Niskayuna, NY (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An improved cooling fan (,) fan for cooling an electronic component includes a rotor (,) rotatably mounted in a housing (,) and having a plurality of fan blades (,). The housing (,) includes a first end (,), a second end (,), and a passage (,) interconnecting the first end and the second end to define an air flow path (,) therebetween. An entry port (,) is defined by an upstream portion of the housing (,) generally adjacent the housing first end (,), with the entry port (,) having a cross-sectional area greater than a cross-sectional area of the passage (,). The entry port (,) and the passage (,) being separated by a transition zone (,), with the entry port (,) and the transition zone (,) cooperating to define an abrupt step (,). The abrupt step (,) is adapted to at least partially affect the flow of air flowing along the flow path (,), thereby reducing the ambient noise level of the fan.