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:
Mar. 04, 2008
Filed:
Feb. 13, 2006
Masamichi Yamada, Hitachinaka, JP;
Masahiro Matsumoto, Hitachi, JP;
Hiroshi Nakano, Hitachi, JP;
Izumi Watanabe, Hitachinaka, JP;
Keiichi Nakada, Hitachinaka, JP;
Masamichi Yamada, Hitachinaka, JP;
Masahiro Matsumoto, Hitachi, JP;
Hiroshi Nakano, Hitachi, JP;
Izumi Watanabe, Hitachinaka, JP;
Keiichi Nakada, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A low-cost thermal flow meter that has good temperature characteristics and little variations. The thermal flow meter includes a sensor element including a heat-generating resistor and at least two temperature-measuring resistors disposed downstream and upstream. The sensor element is positioned in the flow of a measured medium. It also includes an adjusting means for adjusting a excess temperature (ΔTh=Th−Ta) of the heat-generating resistor, which is the difference between the temperature (Ta) of the measured medium and the temperature (Th) of the heat-generating resistor. The adjusting means adjusts the excess temperature (ΔTh) of the heat-generating resistor depending on the temperature of the measured medium such that the excess temperature becomes smaller as the temperature of the measured medium increases.