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:
Sep. 21, 2004
Filed:
Jun. 18, 2002
Nils Elm, Planegg, DE;
Andreas Ludwig, Penzberg, DE;
Andreas May, Munich, DE;
Nikolaus Gerhardt, Oberschleissheim, DE;
Friedrich Widemann, Munich, DE;
Webasto Thermosysteme International GmbH, Stockdorf, DE;
Abstract
A heating system for heating air, especially for heating the interior of a motor vehicle, with a first heater ( ), a second heater ( ), and a flow path between the first heater ( ) and the second heater ( ), there being at least one auxiliary fan ( ) with which a flow in the direction from the second heater ( ) to the first heater ( ) can be produced and a process for influencing the air flows in the heating system are designed to counteract overpressurization. Furthermore, an air heater and a process for detecting backflowing hot air through an air heater use a temperature sensor in an inlet area of the heater for that purpose.