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:
Nov. 05, 2002
Filed:
Apr. 13, 2001
James J. deBlanc, Roseville, CA (US);
David M. Dickey, Roseville, CA (US);
Victoria Tsang Tam, Davis, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
Blower designs for vented enclosures include an impeller having a plurality of blades. A plurality of one way valves are interleaved between the blades to permit substantial airflow only in one direction. One valve design incorporates flaps coupled to either the blades or the impeller body with spring loaded hinges. Another valve design incorporates a flexible flaps coupled to either the blades or the impeller body. In one embodiment, the one-way valves reside on an insertable hub disposed within an inner periphery of the impeller such that the valves and blades are interleaved. The valves close to restrict air flow when the impeller rotational speed is below a threshold range. The valves open to permit air flow when the rotational speed exceeds the threshold range.