Granted Patent B2

US 12,350,613 · App. 18/094,029 · Granted Jul 8, 2025

Inventors: Derek O. Jones (Andover, MN); Keh B. Dema (Johnson City, TN); Stephen M. Larsen (Inver Grove Heights, MN); Mike J. Madsen (Chaska, MN); Andrew J. Dallas (Lakeville, MN); Yehya A. Elsayed (St. Paul, MN); Chuanfang Yang (Eden Prairie, MN)

Assignee: Donaldson Company, Inc.

B01D39/2024B01D39/18B01D2201/18

Abstract

Claims (37)

1. A filter for filtering liquid fuels, the filter comprising:

filter media configured and arranged for placement in a liquid fuel stream, the filter media comprising:

an upstream media layer and a downstream media layer, the upstream media layer comprising:

a) media fiber; and

b) binder fiber having an average diameter greater than the media fiber;

wherein:

the media fiber has an average diameter of 0.1 to 20 microns;

the downstream media layer has a mean pore size greater than the upstream media layer;

the upstream media layer has a max flow pore size at least 2.5 times greater than its mean flow pore size; and

wherein the filter is configured so that upon exposure to a fuel stream containing fuel degradation products, the fuel degradation products are primarily retained in the upstream media layer and wherein upon exposure to a fuel stream containing particulate contaminants, the particulate contaminants are primarily retained in the downstream media layer.

2. The filter for filtering liquid fuels of claim 1 , wherein the media fiber comprises glass fiber.

3. The filter for filtering liquid fuels of claim 1 , wherein the media fiber comprises carbon fiber.

4. The filter for filtering liquid fuels of claim 1 , wherein the binder fiber comprises bicomponent fiber.

5. The filter for filtering liquid fuels of claim 1 , wherein the media fiber has an average diameter of less than 5 microns.

6. The filter for filtering liquid fuels of claim 1 , wherein the binder fiber has an average diameter greater than 5 microns.

7. The filter for filtering liquids of claim 1 , wherein the filter media has a solidity of less than 12 percent.

8. The filter for filtering liquids of claim 1 , wherein the filter media has a solidity of less than 10 percent.

9. The filter for filtering liquids of claim 1 , wherein the filter media has a solidity of less than 9 percent.

10. The filter for filtering liquids of claim 1 , wherein the filter media has a solidity of less than 8 percent.

11. The filter for filtering liquid fuels of claim 1 , wherein the filter media has a compressibility of less than 40 percent at a pressure of 1.24 kg/cm 2 .

12. The filter for filtering liquid fuels of claim 1 , wherein the filter media has a compressibility of less than 20 percent at a pressure of 1.24 kg/cm 2 .

13. The filter for filtering liquid fuels of claim 1 , wherein the filter media has a compressibility of less than 10 percent at a pressure of 1.24 kg/cm 2 .

14. The filter for filtering liquid fuels of claim 1 , wherein the filter media has a mean flow pore of less than 15 microns.

15. The filter for filtering liquid fuels of claim 1 , wherein the filter media has a mode flow pore of at least 20 microns.

16. The filter for filtering liquid fuels of claim 1 , wherein the filter media has an upstream portion and a downstream portion, and wherein the upstream portion has a pore size mode greater than the pore size mode of the downstream portion.

17. The filter for filtering liquid fuels of claim 1 , further comprising a second filter media, the second filter media comprising cellulose fibers, and the second filter media positioned downstream from the filter media comprising a media fiber and a binder fiber.

18. A filter for filtering liquid fuels, the filter comprising:

filter media configured and arranged for placement in a liquid fuel stream, the filter media comprising:

an upstream media layer and a downstream media layer, the upstream media layer comprising:

a) media fiber; and

b) binder fiber having an average diameter greater than the media fiber;

wherein the filter media has a solidity of less than 12 percent, and a compressibility of less than 40 percent at a pressure of 1.24 kg/cm 2 ;

wherein:

the media fiber has an average diameter of 0.1 to 20 microns;

the upstream media layer has a max flow pore size at least 2.5 five times greater than its mean flow pore size; and

wherein the filter is configured so that upon exposure to a fuel stream containing fuel degradation products, the fuel degradation products are primarily retained in the upstream media layer and wherein upon exposure to a fuel stream containing particulate contaminants, the particulate contaminants are primarily retained in the downstream media layer.

19. The filter for filtering liquid fuels of claim 18 , wherein the media fiber comprises glass fiber.

Assignments (2)

Continuity (5)

References Cited (270)