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. 21, 1984
Filed:
May. 29, 1981
Applicant:
Inventors:
Hajime Tachikawa, Fujisawa, JP;
Shuji Ohkawa, Yokohama, JP;
Assignee:
Hitachi Heating Appliances Co., Ltd., Chiba, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219502 ; 250339 ; 356 43 ; 219497 ; 219 / ;
Abstract
Disclosed is a heating apparatus which is capable of heating an object to be heated placed in its heating chamber until the color of the surface of the object changes to a given extent, and in which the wavelength of light of visible spectrum range which is emitted from a light source to illuminate the surface of the object placed in the heating chamber and reflected therefrom is sensed by a color sensor to judge the degree of change in the hue of the surface of the object on the basis of the wavelength sensed by the color sensor to thereby control the heating operation on the basis of the result of judgement.