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. 23, 1996
Filed:
Dec. 06, 1994
Applicant:
Inventors:
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Automotive Engineering Co., Ltd., Ibaraki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
7320417 ; 7320415 ;
Abstract
A hot wire type air flowmeter has a drive circuit for controlling the temperature of a hot wire type resistor and for outputting indications of controlling states as electric signals, an output adjusting circuit for adjusting the electric signals output from the drive circuit, and a subtracter provided in the output adjusting circuit of the hot wire type air flowmeter. The electric signals output from a non-inverting amplifier in the drive circuit are input to one input terminal of the subtracter and a standard voltage supplied via a voltage follower are input to the other input terminal of the subtracter.