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:
Dec. 11, 2001
Filed:
Dec. 21, 1998
Applicant:
Inventors:
Takayuki Itsuji, Hitachinaka, JP;
Hiroshi Hirayama, Hitachinaka, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F 1/68 ;
U.S. Cl.
CPC ...
G01F 1/68 ;
Abstract
An improved heating resistor type air flow measurement apparatus which can operate properly even when the noises are produced by a large surge current, and even when the air flow measurement apparatus is made of plastic member. The apparatus has a heating resistor arranged in the main air passage, a temperature-sensitive resistor and a flow measurement circuit for processing signals from their resistors. Inductors are provided between these resistors to prevent noise invasion into the flow measurement circuit.