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:
Sep. 15, 2009
Filed:
Jan. 25, 2007
Noboru Tokuyasu, Hitachinaka, JP;
Daisuke Terada, Hitachinaka, JP;
Kaori Kashio, Hitachinaka, JP;
Toshiki Otsuki, Hitachinaka, JP;
Katsuaki Fukatsu, Naka, JP;
Hiroshi Onuki, Hitachi, JP;
Jun Kubo, Hitachinaka, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Daisuke Terada, Hitachinaka, JP;
Kaori Kashio, Hitachinaka, JP;
Toshiki Otsuki, Hitachinaka, JP;
Katsuaki Fukatsu, Naka, JP;
Hiroshi Onuki, Hitachi, JP;
Jun Kubo, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A thermal gas-flow measuring instrument has a first heating resistor placed in the gas to be measured. A temperature sensing resistor is positioned upstream or downstream of the first heating resistor and generates signals relating to the flow rate. Between the first heating resistor and the support for supporting the first heating resistor is a second heating resistor that is electrically insulated from the first heating resistor. The second heating resistor suppresses the heat being transferred from the first heating resistor to the support. A control circuit controls the temperatures of the first heating resistor and the second heating resistor so that the operational temperature range of the second heating resistor or the temperature range at the joint section between the first heating resistor and the second heating resistor is at or above the temperature at which water droplets evaporate to disappear by film boiling.