公开(公告)号：US20200179835A1

公开(公告)日：2020-06-11

申请号：US16214510

申请日：2018-12-10

Applicant: BL TECHNOLOGIES, INC.

Inventor： Travis Gerald STIFTER ,  Thomas Martin AUNE

IPC: B01D29/11 ,  B01D29/15 ,  B01D39/16 ,  D01D5/098

Abstract: A tubular depth filter element has three or more concentric zones. Each zone is made of an essentially continuous melt blown filament. The filament of an outer zone preferably has a larger diameter than the filaments of other zones. The outer zone overlaps with at least 85%, and preferably all, of another zone. Optionally, one or more additional filaments may traverse through all of zones. The depth filter element is made by spraying filaments onto a rotating mandrel to form a filament mass in contact with a conical press roller. The filaments are sprayed from three or more nozzles which are spaced apart along the length of the mandrel. One of the filaments is formed in a spray pattern that is angled towards an adjacent spray pattern so as to overlap with at least 50 or 85%, and preferably all, of the adjacent spray pattern.

公开(公告)号：US20240050899A1

公开(公告)日：2024-02-15

申请号：US18547660

申请日：2022-03-03

Applicant: BL TECHNOLOGIES, INC.

Inventor： Travis Gerald STIFTER ,  Viadimir PAVLOVIC ,  Michael WIMBERLY ,  Philip STAFFIN-WIEBE

IPC: B01D63/10

CPC classification number: B01D63/107 ,  B01D2313/08 ,  B01D2313/19

Abstract: A by-pass control sleeve has circumferential protrusions along its outer surface. The protrusions of the by-pass control sleeve may be distributed along the length of the sleeve with constant diameter sections of the sleeve therebetween. The protrusions may be asymmetrical and/or may have a steep and/or concave curved forward face. A method of making a by-pass control sleeve comprises molding the protrusions on an outer surface of the sleeve. A method of installing the by-pass control sleeve comprises sliding the sleeve onto an end of a spiral wound membrane element. A combination of the by-pass control sleeve fixed to the spiral wound membrane element may be installed in a pressure housing.

公开(公告)号：US20220152535A1

公开(公告)日：2022-05-19

申请号：US17587519

申请日：2022-01-28

Applicant: BL Technologies, Inc.

Inventor： Travis Gerald STIFTER ,  Thomas Martin AUNE

IPC: B01D39/16

Abstract: A tubular depth filter element has one or more concentric zones. Each zone includes layers of a melt blown filament. An additional filament oscillates through the depth of the element, traversing through part of the depth of the filament with each oscillation but traversing through substantially all of the depth of the element over multiple oscillations. The traversing filament is preferably biased towards the outside of the element. The depth filter element may be made by spraying filaments onto a rotating mandrel. The filaments of the concentric zones are sprayed from fixed nozzles spaced apart along the length of the mandrel. The traversing filament is sprayed from a nozzle assembly that moves laterally or has compound motion relative to the mandrel. For example, the nozzle assembly may oscillate relative to the mandrel while an air attenuator of the nozzle assembly oscillates relative to the remainder of the nozzle assembly.