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:
Jun. 30, 2009
Filed:
Jul. 27, 2007
Noboru Tokuyasu, Hitachinaka, JP;
Hiroaki Hoshika, Hitachiomiya, JP;
Kaori Kashio, Hitachinaka, JP;
Mituharu Osaka, Atsugi, JP;
Toshiki Ohtsuki, Ayabe, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Hiroaki Hoshika, Hitachiomiya, JP;
Kaori Kashio, Hitachinaka, JP;
Mituharu Osaka, Atsugi, JP;
Toshiki Ohtsuki, Ayabe, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A thermal type gas flowmeter comprising a sensor element which, in turn, comprises at least one first heating resistor, two or more resistors in fluid and a second heating resistor which is disposed between the first heating resistor and a housing supporting the sensor element. The first and second heating resistors are electrically independent from each other. A temperature sensing unit is provided between the first and second heating resistors. A temperature of the first or second heating resistor is controlled by a temperature sensed by the temperature sensing unit.