# US 9,751,036 B2 · Filter cartridge; components thereof; and methods

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- Number: US 9,751,036 B2
- Document ID: US9751036B2
- Status: Granted
- Kind: B2
- Application number: 13/947,833
- Filed: 2013-07-22
- Published: 2013-11-14
- Granted: 2017-09-05
- Earliest claimed: 2009-02-27
- Assignees: Donaldson Company, Inc.
- Applicants: Donaldson Company, Inc.
- Inventors: Thomas D. Raether; Brian Zauner; Mark Belcher; Gabriel Safarian
- Web page: https://patentgrep.com/patent/US9751036B2

## CPC

- B01D 46/528: {using wound sheets (B01D46/527 takes precedence)}
- B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)}
- B01D 46/02: Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D 46/525: {which comprises flutes}
- B01D 46/58: connected in parallel
- B01D 46/71: with pressurised gas, e.g. pulsed air
- B01D 2275/206: Special forms, e.g. adapted to a certain housing
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

Z-filters capable of cleaning particulate matter from airflow streams in dust collectors, including reverse flow, reverse air, and reverse pulse systems.

## Claims

### Claim 1

An air filter cartridge comprising:
(a) a coiled media pack having a first flow face and an opposite second flow face; the media pack including:
(i) a set of inlet flutes open at the first flow face to passage of air to be filtered therein;
(ii) a set of outlet flutes open at the second flow face;
(iii) the media pack being closed to flow of unfiltered air into the first flow face and then outwardly from the second flow face without filtering;
(b) the media pack having first and second rounded ends with first and second straight sides in complete extension therebetween; and
(i) the first rounded end having a greater radius than the second rounded end.

### Claim 2 (depends on 1)

An air filter cartridge according to claim 1 further comprising:
(a) a non-circular core; the media pack being wound around the core.

### Claim 3 (depends on 2)

An air filter cartridge according to claim 2 wherein:
(a) the core is generally sector-shaped.

### Claim 4 (depends on 1)

An air filter cartridge according to claim 1 wherein:
(a) the first flow face is planar.

### Claim 5 (depends on 1)

An air filter cartridge according to claim 1 wherein:
(a) the coiled media pack includes fluted sheet secured to a facing sheet.

### Claim 6 (depends on 5)

An air filter cartridge according to claim 5 further comprising:
(a) a wedge-shaped core; the media pack being wound around the core.

### Claim 7 (depends on 3)

An air filter cartridge according to claim 3 wherein:
(a) the first and second flow faces are planar; and
(b) the coiled media pack includes fluted sheet secured to a facing sheet.