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:
Feb. 08, 2000
Filed:
Sep. 11, 1997
Dennis Wayne Fried, Tucson, AZ (US);
Sung Jin Kim, Taejon, KR;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A fan venturi blockage detector for a DC electric fan and an associated method are disclosed employing a current detector for measuring the input current to the DC electric fan, and a processor connected to the current detector. The processor stores the measured input current value for the minimum input current to the fan under normal operating conditions, and sets a minimum current threshold at a value less than the normal operating condition measured current. The processor compares subsequent measured input current values with the minimum current threshold value, and provides an error signal upon the subsequent measured input current having a value equal to or less than the minimum current threshold value.