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:
Jan. 10, 2012
Filed:
Apr. 23, 2008
Ching-bai Hwang, Taipei Hsien, TW;
Zhi-hui Zhao, Shenzhen, CN;
Ran Lin, Shenzhen, CN;
Fu Zhun Precision Industry (Shen Zhen) Co., Ltd., Shenzhen, Guangdong Province, CN;
Foxconn Technology Co., Ltd., Tu-Cheng, New Taipei, TW;
Abstract
A cooling fan () includes a bottom plate () a top cover () covering the bottom plate, a sidewall () disposed between the bottom plate and the top cover, and an impeller () enclosed in a space formed between the bottom plate, the top cover and the sidewall. The impeller includes a hub (), and a plurality of blades () radially and outwardly extending from the hub. Each of the blades includes a windward surface () and a leeward surface () opposite to the windward surface. The leeward surface of each blade defines three indents () therein. Two protrusions () are formed between adjacent indents. The uneven leeward surface is provided for lowering the noise level generated by the cooling fan during an operation thereof.