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. 13, 2015
Filed:
Jul. 11, 2011
Hans-ullrich Hansmann, Barnitz, DE;
Björn Petersen, Berlin, DE;
Thomas Pernot, Lübeck, DE;
Sandra Dankertt, Wesenberg, DE;
Lutz Rüffert, Scharbeutz, DE;
Marcus Romba, Lübeck, DE;
Hans-Ullrich Hansmann, Barnitz, DE;
Björn Petersen, Berlin, DE;
Thomas Pernot, Lübeck, DE;
Sandra Dankertt, Wesenberg, DE;
Lutz Rüffert, Scharbeutz, DE;
Marcus Romba, Lübeck, DE;
Draeger Safety AG & Co. KGaA, Luebeck, DE;
Abstract
A breathing apparatus includes a filter, a motor and a blower driven by the motor. The filter is disposed ahead of the blower and the blower is configured to generate an air volume flow over the filter. A data storage unit has calibration curves for the air volume flow stored therein and the calibration curves are provided in characteristic line fields referenced to a known ambient pressure (p, p). Each of the characteristic line fields has a reference calibration curve referred to a predetermined operating state. A control unit is connected to the motor and the data storage unit. The control unit is configured to extrapolate one of the characteristic line fields for the operation of the motor by comparing a calibration curve ({dot over (V)}) for an unknown ambient pressure (p) recorded at a predetermined operating state with a reference calibration curve.