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:
Aug. 09, 2022
Filed:
Mar. 16, 2018
Ewald Dörken Ag, Herdecke, DE;
Ronald Flaig, Leverkusen, DE;
Thomas Bachon, Düsseldorf, DE;
EWALD DÖRKEN AG, Herdecke, DE;
Abstract
The invention relates to a roofing underlay (), especially one intended for use as roof cladding underlay and/or roof lining membrane, having at least one outer nonwoven layer (), at least one inner nonwoven layer () and at least one microporous membrane layer () based on at least one polyolefin plastic, wherein the membrane layer () is arranged between the outer nonwoven layer () and the inner nonwoven layer. According to the invention, it is provided that at least one further microporous membrane layer () based on a polyolefin plastic is provided between the outer nonwoven layer () and the inner nonwoven layer and the further membrane layer () is separated from the membrane layer () by a separating layer (), wherein the separating layer () is water-permeable and/or embodied as a structure made of fibers, especially nonwoven.