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:
Jul. 24, 2012
Filed:
Nov. 15, 2007
Rainer Haeberer, Bretten, DE;
Matthias Horn, Freiberg, DE;
Hartmut Lueders, Oberstenfeld, DE;
Leopold Bernegger, Adnet, AT;
Rainer Haeberer, Bretten, DE;
Matthias Horn, Freiberg, DE;
Hartmut Lueders, Oberstenfeld, DE;
Leopold Bernegger, Adnet, AT;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A metering device for introducing liquid reducing agent into an exhaust gas pipe. A metering valve is supplied with contents from a working tank by a delivery unit and dispenses the tank contents in a discharge direction. The delivery unit establishes a negative pressure between the delivery unit and the metering valve when the delivery direction is reversed. The negative pressure causes gas to be drawn off through the metering valve against the discharge direction. The delivery direction is reversed by either a feed pump with a reversible effective direction or a feed pump and a repolarization valve which communicates with the feed pump and transposes an inlet and an outlet of the feed pump.