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US 6,475,270 B1Granted
Nested diffusional filter
Assignee3M Innovative Properties Company
InventorEric G. Graeve
Life of this patent
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Assignee3M Innovative Properties Company
InventorEric G. Graeve
Estimating the term…
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.
A diffusion channel assembly for use with a device enclosure comprising two or more film layers, at least two of said film layers forming cup portions wherein two or more of the cups portions are nested one inside the other and wherein adjacent film layers are spaced from each other to form at least one gap, each of said film layers having a perimeter seal portion substantially around the entire outer perimeter of the film layer, wherein said perimeter seal portions surround the cup portions and form a sealing surface, the perimeter seal portions of adjacent film layers being sealed to create a continuous seal around the cup portions, wherein at least one gap coupled with the vent holes of an adjacent film layer forming at least one diffusion channel.
A method of forming a diffusion channel assembly for use in electronic enclosures comprising providing a two or more film layers having a plurality of cup portions spaced equally along the length of two or more film layers and land areas between the cup portions, providing vent holes in the cup portions, continuously nesting the cup portions of adjacent film layers forming gaps between the adjacent cup portions, continuously adhering the land areas between the cup portions and separating individual nested cup portions to form discrete diffusion channel assemblies.
Dependencies are inferred from the claim text.