IP Library › Granted Patent US 12,383,871
Granted Patent B2
US 12,383,871 · App. 17/825,761 · Granted Aug 12, 2025

Structures having re-entrant geometries on a porous material surface

Inventors: Mikayla A. Yoder (Eagan, MN); Christopher P. Conklin (Columbia, MD); Davis B. Moravec (Burnsville, MN); Andrew J. Dallas (Lakeville, MN); Tianheng Zhao (Cambridge, GB); Richard W. Janse van Rensburg (Great Cambourne, GB); Peter Jackson (Royston, GB); Blane Scott (Cambridge, GB)
Assignee: Donaldson Company, Inc.
B01D69/12B01D69/02B01D71/52B01D2325/02B01D2325/08B01D2325/38
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Quick Facts
Patent No.
US 12,383,871
App. No.
17/825,761
Granted
Aug 12, 2025
Kind
B2
Abstract

A filter material has a layer of porous material and a plurality of structures disposed on a surface of the layer, where each of the structures has a re-entrant geometry. The plurality of structures may be a plurality of ordered structures. A filter material may include a layer of porous material and a plurality of re-entrant structures disposed on a surface of the layer, each of the re-entrant structures including a stem and a cap, where the caps of adjacent structures are attached to each other to form a plurality of pores, where each pore is disposed between adjacent re-entrant structures.

Claims (14)

1. A filter material comprising:

a first layer of porous material, the first layer comprising a single layer of material comprising:

a plurality of re-entrant structures, each of the re-entrant structures comprising a stem and a cap, and adjacent structures being connected to each other by their caps and stems, forming a continuous lattice of connected re-entrant structures; and

a plurality of pores formed by or between the re-entrant structures,

wherein the pores are through-holes extending through the layer of porous material.

2. The filter material of claim 1 , wherein the porous material is a membrane.

3. The filter material of claim 1 , further comprising a second plurality of structures disposed on an opposing surface of the first layer.

4. The filter material of claim 1 , wherein each of the plurality of structures is disposed in an array having a first dimension and a second dimension, and wherein a first lattice pitch between structures in the first dimension of the array is different from a second lattice pitch between structures in the second dimension of the array.

5. The filter material of claim 1 , wherein a surface of the first layer comprises one or more grooves positioned between the pores.

6. The filter material of claim 1 , wherein the pores have a pore diameter of 1 μm to 100 μm.

7. The filter material of claim 1 , wherein the filter material comprises venting media.

8. The filter material of claim 2 , wherein the membrane comprises one or more of polypropylene, polyethylene, polyester, polyethersulfone, polysulfone, expanded polytetrafluoroethylene, polyvinylidene fluoride, polyamide, polyacrylonitrile, polycarbonate, cellulose acetate, and nylon.

9. The filter material of claim 1 , further comprising a second layer disposed along a surface of the first layer of porous material, wherein the second layer comprises filtration media.

10. A filter element comprising the filter material of claim 1 .

Assignments (4)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 15, 2022
From: YODER, MIKAYLA A.; MORAVEC, DAVIS B.; CONKLIN, CHRISTOPHER P.; DALLAS, ANDREW J.
To: DONALDSON COMPANY, INC.
Reel/Frame 060211/0246 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 15, 2022
From: ZHAO, TIANHENG; JANSE VAN RENSBURG, RICHARD W.
To: TTP PLC
Reel/Frame 060214/0177 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 15, 2022
From: TTP PLC
To: DONALDSON COMPANY, INC.
Reel/Frame 060214/0242 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 15, 2022
From: JACKSON, PETER; SCOTT, BLANE
To: TTP PLC
Reel/Frame 060214/0350 →
Continuity (2)
Provisional Application 63193807 · May 27, 2021
Related Publication 20220379268A1 · Dec 1, 2022
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