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:
Apr. 19, 2011
Filed:
Sep. 09, 2008
Masatoshi Nishizawa, Kawasaki, JP;
Tomoki Harada, Kawasaki, JP;
Goro Nakagai, Kawasaki, JP;
Toyohiro Kato, Kawasaki, JP;
Masatoshi Nishizawa, Kawasaki, JP;
Tomoki Harada, Kawasaki, JP;
Goro Nakagai, Kawasaki, JP;
Toyohiro Kato, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The inventors have revealed that the actual rotation speed of the rotor in a fan structured as a centrifugal fan exceeds the designated rotation speed if the ventilation opening of the centrifugal fan is occluded. If a larger amount of dust accumulates at the ventilation opening of the centrifugal fan, for example, the actual rotation speed of the rotor in the centrifugal fan exceeds the designated rotation speed by a predetermined deviation. The accumulation of dust at the ventilation opening can in this manner be observed in a facilitated manner. The occlusion of the ventilation opening can thus be detected.