IP Library › Granted Patent US 12,558,639
Granted Patent B2
US 12,558,639 · App. 16/970,109 · Granted Feb 24, 2026

Filter element configurations

Inventors: Aflal Rahmathullah (Savage, MN); Andrew J. Dallas (Lakeville, MN); Brian R. Tucker (Farmington, MN); Daniel E. Adamek (Bloomington, MN); Paul A. Way (Edina, MN); Scott A. Betcher (Lakeville, MN); Vijay K. Kapoor (Eagan, MN); Colter A. Marcks (Ellsworth, WI); William S. Rossiter (Brooklyn Park, MN); Timothy O. Winters (Nowthen, MN); Wijadi Jodi (Burnsville, MN); Davis B. Moravec (Burnsville, MN); Stephen K. Sontag (Maple Grove, MN); Bradly G. Hauser (Minneapolis, MN); Matthew P. Goertz (Bloomington, MN); Derek O. Jones (Andover, MN); Yehya A. Elsayed (Dearborn, MI); Stuti S. Rajgarhia (Bloomington, MN); Charles S. Christ (Deephaven, MN); Joseph M. Block (Carver, MN)
Assignee: Donaldson Company, Inc.
B01D39/18B01D17/045B01D29/016B01D35/005B01D39/1623B01D39/2068B01D46/0005B01D46/0031B01D46/005B01D46/523B01D46/526B01D46/527B01D2201/127B01D2239/0421B01D2239/0478B01D2239/0627B01D2239/065B01D2239/0695B01D2239/1208B01D2239/1216B01D2265/04
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Quick Facts
Patent No.
US 12,558,639
App. No.
16/970,109
Granted
Feb 24, 2026
Kind
B2
Abstract

The current technology relates to various filter elements configurations where a substrate layer defines a surface having a treatment. The treatment increases a roll off angle of the surface for a 50 water droplet when the surface is immersed in toluene. The filter element can have a housing and the substrate disposed in the housing. In some embodiments the substrate layer defines a plurality of pleats extending between pleat folds that form flow faces of the media. In some embodiments the substrate is incorporated into single facer media of a filter element. In some embodiments the substrate layer is incorporated in a filter element having a flow-by configuration. In some embodiments the substrate layer is incorporated in a filter element having a cross-flow configuration. Some embodiments relate to a vent. Some embodiments relate to a barrier assembly and/or a fuel filter element. Various other filter elements are described.

Claims (20)

1 . A filter element comprising:

a substrate layer defining a first surface having a roll off angle in a range of 50 degrees to 90 degrees and a contact angle in a range of 90 degrees to 180 degrees for a 50 μL water droplet when the first surface is immersed in toluene, wherein the substrate layer comprises cellulose, glass, or a combination thereof, wherein the substrate layer defines a plurality of pleats extending between a first set of pleat folds and a second set of pleat folds, wherein the first set of pleat folds defines a first face and the second set of pleat folds defines a second face.

2 . The filter element of claim 1 , wherein the first face is opposite the second face relative to the filter element.

3 . The filter element of claim 1 , wherein a distance between each adjacent pleat fold in the first set of pleat folds is greater than a distance between each adjacent pleat fold in the second set of pleat folds.

4 . The filter element of claim 1 , further comprising pleat spacers disposed between each pleat fold in the first set of pleat folds.

5 . The filter element of claim 1 , wherein the first face defines a curved plane.

6 . The filter element of claim 1 , wherein the substrate layer defines a plurality of flutes extending between the first set of pleat folds and the second set of pleat folds.

7 . The filter element of claim 6 , wherein a portion of the plurality of flutes are tapered.

8 . The filter element of claim 1 , wherein the substrate layer defines a second surface opposite the first surface, wherein the second surface has a roll off angle in a range of 50 degrees to 90 degrees and a contact angle in a range of 90 degrees to 180 degrees for a 50 μL water droplet when the second surface is immersed in toluene.

9 . The filter element of claim 1 , wherein the first face defines an outer cylindrical surface and the second face defines an inner cylindrical surface.

10 . The filter element of claim 1 , wherein the roll off angle of the first surface is in a range of 60 degrees to 90 degrees, in a range of 70 degrees to 90 degrees, or in a range of 80 degrees to 90 degrees.

11 . The filter element of claim 1 , wherein the first surface comprises a UV-treated surface.

12 . The filter element of claim 1 , wherein the first surface comprises a UV-oxygen-treated surface.

13 . The filter element of claim 1 , wherein the substrate layer comprises at least one of an aromatic component and an unsaturated component.

14 . The filter element of claim 1 , wherein the substrate layer comprises a UV-reactive resin.

15 . The filter element of claim 1 , wherein the first surface comprises a hydrophilic group-containing polymer.

16 . The filter element of claim 15 , wherein the hydrophilic group-containing polymer comprises a hydrophilic pendant group.

17 . The filter element of claim 15 , wherein the hydrophilic group-containing polymer does not comprise a fluoropolymer.

18 . The filter element of claim 15 , wherein the hydrophilic group-containing polymer comprises a hydrophilic polymer.

19 . The filter element of claim 1 , wherein the substrate layer does not comprise polyethylene terephthalate.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 12, 2021
From: RAHMATHULLAH, AFLAL; DALLAS, ANDREW J.; TUCKER, BRIAN R.; ADAMEK, DANIEL E.; WAY, PAUL A.; BETCHER, SCOTT A.; KAPOOR, VIJAY K.; MARCKS, COLTER A.; ROSSITER, WILLIAM S.; WINTERS, TIMOTHY O.; JODI, WIJADI; MORAVEC, DAVIS B.; SONTAG, STEPHEN K.; HAUSER, BRADLY G.; GOERTZ, MATTHEW P.; JONES, DEREK O.; ELSAYED, YEHYA A.; RAJGARHIA, STUTI S.; CHRIST, CHARLES S.; BLOCK, JOSEPH M.
To: DONALDSON COMPANY, INC.
Reel/Frame 055892/0094 →
Continuity (2)
Provisional Application 62631384 · Feb 15, 2018
Related Publication 20210016214A1 · Jan 21, 2021
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