Browse Prior Art Database

DESIGN FOR OZONE REDUCTION FILTER

IP.com Disclosure Number: IPCOM000024163D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 172K

Publishing Venue

Xerox Disclosure Journal

Abstract

This proposal is directed to an improved design for ozone reduction filters. The device may be incorporated as a filtration unit in any conventional, electrostato-graphic reproduction equipment requiring filtration devices.

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This is the abbreviated version, containing approximately 53% of the total text.

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XEROX DISCLOSURE JOURNAL

DESIGN FOR OZONE REDUCTION FILTER
Judy Nagel

Proposed Classification
U.S. C1. 55/270

Int. C1. Bold 53/30

/ 3

This proposal is directed to an improved design for ozone reduction filters. The device may be incorporated as a filtration unit in any conventional, electrostato- graphic reproduction equipment requiring filtration devices.

It is well known that the production of a corona discharge in air usually generates ozone which adversely effects uniform charging and which, even in very small quantities, is considered toxic to humans. Ozone emissions in such an environment are generally controlled by llfiltering" devices which are impregnated with catalysts capable of conversion of the ozone to relatively harmless substances. Ozone "filtering" devices for electrostatographic copiers have been located in the copier exhaust stream. 'Exemplary of such filtering devices are those described in U.S. Patent 4,143,118 which discloses that catalysts may be impregnated into a porous support which is integrated within the copier exhaust housing, or alternatively, the catalyst may be incorporated in the corona discharge electrode structure itself as described in U.S. Patent 3,675,096.

An improved design for reducing ozone by filtration in accordance with the present disclosure uses a non-woven textile optionally coated or impregnated with an ozone reducing catalyst. In general, the ozone filter element consists of three interlocking elements, one of which is a catalyst container element enclosed by two end plate elements. The end plate elements and the catalyst container element are preferably made of rigid plastic material. The non-woven textile material optionally precoated or impregnated with ozone reducing catalyst is fit over the inner catalyst container which also contains an ozone reducing catalyst.

Volume 4 Number 6 November/December 1979 697

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DESIGN FOR OZONE REDUCTION FILTER (Cont'd)

Figure 1 illustrates a cross section of a typical filter design in accordance with the present disclosure. The elements are disassembled in Figure 1 to illustrate more clearly the improved design. The filter holder of Figure 1 consists of three main elements; namely, end plate 1, catalyst container 2 and end plate 3. Elements 1, 2 and 3 are constructed preferably of plastic so that the elements interlock when assembled. End plate 1 and end plate 3 contain a fine mesh screen 7 to permit the flow of air and other gases through the end plates. Air flow is shown by arrows in Figure 1. Catalyst container 2 is constructed so that the air containing ozone passes through catalyst or filter medium 4.

In Figure 1, a non-woven textile 5 and 6 (optionally precoated or impregnated with an ozone reducing catalyst) is fit over each side of catalyst container 2 so that end plate 1 and end plate 3 securely hold the overlapping textile 5 and 6 in place when elements 1, 2 and 3 ar...