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:
Apr. 08, 1980
Filed:
Jan. 14, 1977
Paul Van Ackeren, Duisburg, DE;
Heinz Dahlmann, Duisburg, DE;
Helmut Gauter, Duisburg, DE;
Wilhelm Thielmann, Duisburg, DE;
Mannesmann Aktiengesellschaft, Dusseldorf, DE;
Abstract
Disclosed is a method and apparatus for calibrating and recalibrating a photometric measurement instrument which supervises the presence of dust in a particular location as produced by a process during which dust is developed on an irregular basis. The method is characterized in that the calibration is initiated upon the detection of a condition in which dust concentration is expected to be low. In a steel-making process, such a condition occurs upon termination of the blowing phase of a converter. In the case of smoke in a flue, such a condition occurs when there is an absence of gas flow in the flue.