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:
Sep. 07, 2004
Filed:
Oct. 02, 2002
Takafumi Matsumura, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An apparatus for measuring a gas flow rate, which includes one or more resistors arranged in a gas passage, and a gas flow rate detection circuit for outputting a gas flow rate detection signal in accordance with a gas flow rate by detecting currents flowing through the resistors or voltages generated in accordance with the currents. The apparatus includes a fixed resistor connected in series to one of the resistors, and a first A/D converter circuit for converting an input voltage into a digital signal based on a reference voltage and outputting the digital signal by using a voltage generated in the fixed resistor as the reference voltage and using a voltage generated in a combined resistance of the resistor and the fixed resistor as the input voltage, wherein a digital output signal of a gas temperature detection signal is obtained by the first A/D converter circuit.