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:
Dec. 11, 1984
Filed:
Mar. 30, 1983
John G Olin, Carmel Valley, CA (US);
David M Korpi, Monterey, CA (US);
Sierra Instruments, Inc., Carmel Valley, CA (US);
Abstract
An improved mass flowmeter of the type having a primary passage for the fluid whose flow rate is to be measured, a sensor tube which serves as a secondary passage for the fluid and is connected to the primary passage at upstream and downstream locations, and a pair of resistance wire coils surrounding the sensor tube and connected to a bridge circuit in which the resistance differential between the wire coils is proportional to the fluid flow rate. The sensor tube is a straight tube displaced from the primary passage and accessible at its ends for cleaning. The wire coils and the corresponding portion of the sensor tube are surrounded by an evacuated enclosure to prevent convection effects between the adjacent coils, to maximize the response time of the coils to changes in fluid flow rate, and to reduce conduction losses.