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. 25, 2019
Filed:
Dec. 19, 2016
Tigers Polymer Corporation, Osaka, JP;
Shinsuke Mizuta, Hyogo, JP;
Shota Umemoto, Hyogo, JP;
TIGERS POLYMER CORPORATION, Osaka, JP;
Abstract
Provided is a non-woven filtration material including a multilayer structure having a density gradient. The multilayer structure includes a coarse layer disposed at an upstream side of the non-woven filtration material and a dense layer disposed at a downstream side of the non-woven filtration material. The coarse layer and the dense layer are dry layers. The coarse layer contains 30% to 60% by weight of crimped conjugated fibers and contains 30% to 70% by weight of finer fibers. The crimped conjugated fibers have an average fiber diameter in a range from 15 μm to 45 μm. The finer fibers have an average fiber diameter that is in a range from 5 μm to 20 μm and smaller than the average fiber diameter of the conjugated fibers.