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. 10, 2005
Filed:
May. 20, 2003
Koji Tanimoto, Tokyo, JP;
Naruki Suetake, Tokyo, JP;
Koji Tanimoto, Tokyo, JP;
Naruki Suetake, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A thermal type flow rate detector includes: a bridge circuit constructed by upstream side and downstream side temperature detecting elements for detecting a temperature of fluid flowing from the upstream side to the downstream side, and fixed resistors; and a temperature difference controlling circuit for continuously supplying an electric power to upstream side and downstream side heat generating elements so that a temperature difference between the temperature detecting elements becomes a predetermined value. The temperature difference controlling circuit includes: a differential amplifier connected to the bridge circuit; a first constant voltage power supply; a second constant voltage power supply having a lower constant voltage than that of the first constant voltage power supply; and the upstream side and downstream side heat generating elements.