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:
Jan. 11, 1983
Filed:
Nov. 13, 1980
Franz-Josef Rohr, Absteinach, DE;
Rudolf Krapf, Leimen, DE;
Brown, Boveri & Cie Aktiengesellschaft, Mannhein-Kafertal, DE;
Abstract
Electrochemical measuring device for determining the oxygen content in gases with approximately constant pressure, especially in combustion exhaust gases, with an oxygen ion-conducting solid electrolyte having two electrodes connected to a voltage source, and measuring changes in current. In combination with the electrical measuring device, a constriction is disposed in the path of the constant pressure gas stream with the constriction having a passageway of cross sectional area to pass the gas stream at the velocity of sound under the condition of critical pressure ratio dependent on a ratio of the pressure at the outflow side of the inflow side of the constriction which brings about sound velocity of the gas stream.