3m Innovative Properties Company

Malcolm R Watson

Desmond T Curran

Christopher P Henderson

Andrew S Viner

Elfed I Williams

Brian Cormack

Audra A Conlan

Method for making a filter cartridge that is suitable for attachment to a respiratory mask. The method comprises the steps of (a) providing a mass of filter material; (b) providing a filter cartridge housing that has an inlet and outlet and a sidewall that includes sheet material; and (c) thermoforming the sheet material of the housing sidewall around at least part of the mass of filter material to place the housing sidewall in direct contact with the mass of filter material to encapsulate the filter material so that fluid is prevented from passing through the filter cartridge from the inlet to the outlet without being filtered by the mass of filter material.

Method of making a filter cartridge using a thermoforming step

A filter cartridge (), suitable for attachment to a respiratory mask, has a housing that includes an air inlet (), an air outlet (), and filter material () through which air to be filtered travels through when passing from the inlet to the outlet. At least part of the housing includes a sheet material () that is thermo-formed around the sides of the filter material.

Filter element that has a thermo-formed housing around filter material

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County Durham, United Kingdom

Malcolm R Watson