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. 15, 2003
Filed:
May. 09, 2001
Applicant:
Inventors:
Takashi Takizawa, Kawasaki, JP;
Hiroshi Nishida, Akita, JP;
Assignee:
Fujikura, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 1/02 ;
U.S. Cl.
CPC ...
H05B 1/02 ;
Abstract
A current-limiting resistor is connected between a power-supply line and a heater provided near the oxygen-detecting element of limiting-current type oxygen sensor. A power MOSFET is connected between the heater and a ground line. The resistor and the heater have such resistances that a current I2 flowing through the resistor and the heater when the heater has a resistance R2 is about I1{square root over ((R1/R2))}, where I1 is a current flowing through the resistor and the heater when the heater has a resistance R1.