# US 2006/0231475 A1 · Filter element and filter device having replaceable filters

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- Number: US 2006/0231475 A1
- Document ID: US20060231475A1
- Status: Published application
- Kind: A1
- Application number: 11/452,759
- Filed: 2006-06-14
- Published: 2006-10-19
- Earliest claimed: 2001-07-17
- Inventors: Kazunori Sudo; Yoshiki Nomura
- Web page: https://patentgrep.com/patent/US20060231475A1

## CPC

- B01D 29/21: with corrugated, folded or wound sheets
- B01D 29/15: arranged for inward flow filtration
- B01D 29/216: {with wound sheets}
- B01D 29/58: arranged concentrically or coaxially
- B01D 29/96: in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters (B01D29/09, B01D29/70 take precedence)
- B01D 2201/0407: Perforated supports on both sides of the filtering element
- B01D 2201/0415: Details of supporting structures
- B01D 2201/4015: Bayonet connecting means
- 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

Providing a filter device with various functions, such as remarkable improvement of the throughput of the downstream filter, ion-removing property of the upstream filter. A filter element comprises an upstream filter and a downstream filter made of the same or different material and installed into one housing or container, wherein said downstream filter is fixed to said housing, said upstream filter is fixed to said downstream filter, both filters are concentrically arranged to each other, and when the downstream filter is not contaminated, only the upstream filter can be replaced with fresh one.

## Claims

### Claim 1

(canceled)

### Claim 2

(canceled)

### Claim 3

(canceled)

### Claim 4

(canceled)

### Claim 5

(canceled)

### Claim 6

(canceled)

### Claim 7

(canceled)

### Claim 8

(canceled)

### Claim 9

(canceled)

### Claim 10

(canceled)

### Claim 11

(canceled)

### Claim 12

A disposable filter device having an upstream filter and a downstream filter integrally fixed in a housing, wherein each of said upstream filter and downstream filter is selected respectively from different sets of filters.