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:
Jun. 17, 2025
Filed:
Dec. 18, 2017
Johns Manville, Denver, CO (US);
Jürgen Umminger, Lauda-Königshofen, DE;
Johns Manville, Denver, CO (US);
Abstract
A filter is formed by a multilayer filter medium comprising at least one textile supporting layer, at least one filter layer which is applied to at least one side of the supporting nonwoven, wherein the filter layer is constructed from glass fibres, and at least one textile covering layer which is applied to the filter layer, wherein the filter layer comprises a mixture of at least two types of glass fibres, wherein the first glass fibre type of the mixture has a diameter of 0.6 μm±0.3 μm, and wherein the second glass fibre type of the mixture has a diameter of 1.0 μm±0.3 μm, and wherein the first and second glass fibre types of the mixture are present in a ratio by weight in the range 1:1.1 to 1:4.