3M Innovative Properties Company

Eric G Graeve

Yuan-Ming Tang

John C Kostecki

A diffusion channel assembly for use with a device enclosure with two or more nested cups forming at least one diffusion channel. The nested cups are formed of a thermoplastic film material. Each of the cups has a perimeter seal portion substantially around the entire outer perimeter of the cups and surrounding a cup portion having a vent hole. The perimeter seal portions form a sealing surface and are generally integral with the cup portions. The cup portions have vent holes and at least one gap between adjacent cup portions that connect the vent holes of the adjacent cup portions. The gaps coupled with the vent holes of adjacent cup portions form at least one diffusion channel of a length of at least 5 mm. The perimeter seal portions are sealed to form an airtight seal around the cup portion forming an integral diffusion channel assembly. Preferably, a sorbent filter material is included in the cavity formed by the innermost cup portion and is contained in this cup portion by a cover layer attached to the perimeter seal portion of the innermost cup portion.

Nested diffusional filter

A self-supporting filter of adsorbent particles is provided by agglomerating the adsorbent particles with a thermoplastic binder and forming a self-supporting filter with a low pressure drop and high efficiency suitable for use as an automotive cabin filter.

Growing community of inventors

Eagan, MN, United States of America

Eric G Graeve