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:
May. 17, 2011
Filed:
Oct. 30, 2008
Naoki Saito, Tokai, JP;
Takeshi Morino, Hitachinaka, JP;
Yuki Okamoto, Hitachinaka, JP;
Keiji Hanzawa, Mito, JP;
Hiromu Kikawa, Hitachinaka, JP;
Akio Yasukawa, Kashiwa, JP;
Naoki Saito, Tokai, JP;
Takeshi Morino, Hitachinaka, JP;
Yuki Okamoto, Hitachinaka, JP;
Keiji Hanzawa, Mito, JP;
Hiromu Kikawa, Hitachinaka, JP;
Akio Yasukawa, Kashiwa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An air flow measuring instrument, comprising: an auxiliary passagearranged inside a main passage through which fluid flows, a tabular memberon which a pattern of a heating resistor for measuring an air flow is provided on one face, the tabular member being disposed inside the auxiliary passage so that the one faceon which the heating resistor pattern of the tabular member is provided is disposed along a flow of fluid inside the auxiliary passage, a heating resistor pattern-side fluid passageportion formed so that the fluid flows between the faceand a passage-forming surfaceof the auxiliary passage, and a back-surfaceside fluid passage portion formed so that fluid flows between a faceon a side opposite to the face of the tabular member and the passage-forming surface of the auxiliary passage. Guidance portionguiding dust that collides against the end portion to back-surface side fluid passage portionside is provided on upstream-side end of tabular member.