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:
Dec. 24, 2024
Filed:
Sep. 18, 2019
Daicen Membrane-systems Ltd., Tokyo, JP;
Nipro Corporation, Osaka, JP;
DAICEN MEMBRANE-SYSTEMS LTD., Tokyo, JP;
NIPRO CORPORATION, Osaka, JP;
Abstract
A hollow fiber porous membrane includes polyethersulfone or polysulfone. The hollow fiber porous membrane has an inner diameter from 300-600 μm, a thickness from 70-200 μm, a molecular weight cut-off of 10000 or lower, and a plurality of pores having a pore diameter from 0.1-0.5 μm throughout an outer surface; and a bulging rate of less than 5%. For 20 or more of the hollow fiber porous membranes, after a membrane thickness in a cross section of each one of the hollow fiber porous membranes in the width direction is measured at randomly selected 10 or more locations, an average membrane thickness is calculated based on 200 or more locations in total, and the bulging rate is calculated by a formula below: Bulging Rate (%)=(location numbers where the membrane thickness as measured exceeded 1.3 times the average membrane thickness)/(membrane thickness measurement numbers)×100.