Abstract: The present invention relates to hearing aid microphone covers and methods of manufacturing the same. In an embodiment, the invention includes a microphone cover for a hearing aid including a frame defining one or more exterior apertures and one or more media apertures, and a filtration media attached to the frame, the filtration media configured to completely occlude the one or more exterior apertures. In an embodiment, the invention includes a method of forming a microphone cover for a hearing aid including placing oleophobic and hydrophobic filtration media within a mold and forming a polymeric frame around the filtration media by injecting a polymer composition into the mold.

Abstract: A multiple diffusion channel filter assembly is disclosed. The filter assembly provides filtration of air entering and exiting an electronic enclosure through a breather hole. In one implementation, the filter assembly contains a housing with an adsorbent component and a first diffusion channel and a second diffusion channel. In another implementation, the filter assembly contains a first layer and a second layer which surround an adsorbent component and a first and a second diffusion channel that are in fluid communication with the interior space defined by the first and second layers. In yet another implementation, the invention, includes a filter accessory containing a diffusion channel configured to work in conjunction with a separate filter assembly thereby adding an additional diffusion channel to the existing design.