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. 28, 2009
Filed:
Apr. 12, 2007
Applicants:
Yoshihiro Sukegawa, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Kaori Kashio, Hitachinaka, JP;
Daisuke Terada, Hitachinaka, JP;
Inventors:
Yoshihiro Sukegawa, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Kaori Kashio, Hitachinaka, JP;
Daisuke Terada, Hitachinaka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F 1/68 (2006.01);
U.S. Cl.
CPC ...
Abstract
A flow rate measuring element of a thermal type flow sensor is placed in the fluid to be measured. The element includes: a first heating resistor for measuring a flow rate; a second heating resistor for heating a support for the first heating resistor; and current control circuits and which control heating resistor supply current so that the temperature of the second heating resistor is higher than the temperature of the first heating resistor.