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:
Nov. 27, 1990
Filed:
Jun. 22, 1989
Leybold Aktiengesellschaft, Hanau, DE;
Abstract
A thermal mass flow-meter used in particular for corrosive and hot gases. It includes a flow duct having at least two measuring resistors. At least one of these is arranged in the flow cross-section. At least one heat source is provided in the zone of influence of the measuring resistors; heat source and measuring resistance may be identical. For the purpose of obtaining long-term resistance to corrosion accompanied by great sensitivity as regards response, the measuring resistors consist of a thin-film resistor with a ceramic insulating member, a measuring resistor is connected to a ceramic support member by way of glass solder, and the support member is in turn connected to the flow duct by way of a glass solder element.