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. 29, 1993
Filed:
Jun. 10, 1991
Naoki Matubara, Tokyo, JP;
Hiroyuki Katougi, Tokyo, JP;
Oval Engineering Co., Ltd., Tokyo, JP;
Abstract
A heat-conductive stream pipe has an upstream side and a downstream side temperature-sensing element having resistance wires wound round the pipe at a certain distance there-between to assure that there will be no thermal influence with each other. A control means controls a bridge circuit including a ground point at one end and a connecting point at the other end of each of the temperature-sensing elements so as to keep the temperature difference between the upstream side and the downstream side temperature-sensing elements at a constant level. An adjustable auxiliary heater is placed on the stream pipe at the downstream side near the downstream side temperature-sensing element. The mass flow of the fluid is determined by the voltage measured at the connecting point of the downstream side temperature-sensing element.