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:
Oct. 09, 2018
Filed:
May. 13, 2013
Rainer Goering, Borken, DE;
Michael Boeer, Olfen, DE;
Juergen Franosch, Marl, DE;
Joerg Westmeier, Krefeld, DE;
Otfried Schwarzkopf, Kuerten, DE;
Daniel DE Beer, Engelskirchen, DE;
Rainer Goering, Borken, DE;
Michael Boeer, Olfen, DE;
Juergen Franosch, Marl, DE;
Joerg Westmeier, Krefeld, DE;
Otfried Schwarzkopf, Kuerten, DE;
Daniel De Beer, Engelskirchen, DE;
EVONIK DEGUSSA GmbH, Essen, DE;
VOSS AUTOMOTIVE GmbH, Wipperfuerth, DE;
Abstract
A heatable line pipe useful for diesel fuel systems and fuel cell systems is provided. The heatable line pipe comprises in order from an inside of the pipe: a) an electrically insulating inner layer; b) a first electrically conductive layer; c) at least two current leads wound spirally around the first electrically conductive layer; d) a second electrically conductive layer over the at least two current leads forming a surface; and e) an outer cladding of an electrically insulating plastic material. The thickness of the second electrically conductive layer is 0.1 to 1.5 mm, and the at least two current leads form wave peaks in the surface of the second electrically conductive layer. The line pipe has the advantage that a fall in heating performance over the lifetime is effectively prevented.