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. 24, 2001
Filed:
Dec. 11, 2000
Applicant:
Inventors:
Franco Brindani, Casciago, IT;
Luca Frasnetti, Cunardo, IT;
Assignee:
Whirlpool Corporation, Benton Harbor, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A23L 1/00 ; A23L 3/00 ; A21B 1/00 ; F24C 3/00 ; A47J 2/726 ;
U.S. Cl.
CPC ...
A23L 1/00 ; A23L 3/00 ; A21B 1/00 ; F24C 3/00 ; A47J 2/726 ;
Abstract
A device for sensing the presence of cooking utensils on a cooking hob comprising at least one heat source. The device includes an electrically conductive coil turn fed by the signal generated by an oscillator. The oscillator is preferably a voltage-controlled oscillator generating square wave signals. The coil turn operates, when utensil sensing occurs, to modify the cut-off frequency of a low pass filter (L/R) fed by said oscillator (VCO).