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:
Aug. 05, 1997
Filed:
Jun. 07, 1995
Hiroshi Yoneda, Hitachinaka, JP;
Masuo Akamatsu, Hitachinaka, JP;
Hitachi, Ltd., , JP;
Abstract
A heat type air flow meter with improved resistance to radio wave interference by restraining a high frequency noise from a resistor and the supporting materials thereof provided in air passage. At least one high frequency band cut-off filter having a capacitor and a inductor is provided between, on one hand, a heating resistor and a heat sensitive resistor and, on the other hand, a temperature control circuit, and an intermediate connecting point of one end of the capacitor connected with one end of the inductor is also connected to both resistors. Thereby, as the resistivity to the radio wave interference is effectively improved cost reduction and compactness of the flow meter can be achieved.