Filter with diffusion channel and methods of making and using the filter
AssigneeDonaldson Company, Inc.
InventorsDaniel L. Tuma, Randy J. Logan, Andrew C. Dahlgren
Life of this patent
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Abstract
A filter has a channel layer film defining a channel, a boundary layer mounted to at least a portion of the channel layer film and forming a non-adhesive boundary for the channel, and filter media disposed in fluid communication with the channel. The boundary layer typically includes a non-porous or semipermeable film. The filter is configured and arranged to provide for flow of at least a portion of a fluid along the channel and into the filter media. This filter can be used in a device as a filter over a vent in a housing of the device.
Claims29
A filter comprising:
- a channel layer film defining a channel;
- a boundary layer laminated to at least a portion of the channel layer and forming a non-adhesive boundary for the channel;
- and
- filter media disposed in fluid communication with the channel;
- wherein the filter is configured and arranged for flow of at least a portion of a fluid along the channel and into the filter media.
A filter comprising:
- a channel layer film with mounting adhesive and lamination adhesive disposed on opposing sides of the channel layer film, the channel layer film, mounting adhesive, and lamination adhesive having a diffusion channel and a passageway formed therein, the diffusion channel and the passageway being spaced apart and the diffusion channel extending to a sidewall of the channel layer film to form an opening in the filter;
- a boundary layer laminated to at least a portion of the channel layer film by the lamination adhesive, a portion of the boundary layer forming a non-adhesive boundary for the diffusion channel;
- filter media mounted between the boundary layer and the channel layer film, in fluid communication with the diffusion channel, and over the passageway;
- wherein the filter is configured and arranged for flow of fluid through the opening, along the diffusion channel, into the filter media, and through the passageway to exit the filter.
A device, comprising:
- a housing;
- a port in the housing;
- and
- a filter over the port, the filter including
- a channel layer film defining a channel;
- a boundary layer laminated to at least a portion of the channel layer film and forming a non-adhesive boundary for the channel;
- mounting adhesive disposed on an exterior surface of the filter for mounting the filter on the housing over the port;
- and
- filter media disposed in fluid communication with the channel;
- wherein the filter is configured and arranged for flow of at least a portion of a fluid from the port, along the channel, and into the filter media.
A method for making a filter, comprising:
- forming a channel in a channel layer film by removing a portion of the channel layer film;
- disposing a filter layer in fluid communication with the channel;
- and
- laminating a boundary layer to the channel layer film, a portion of the boundary layer forming a non-adhesive boundary of the channel.
A filter comprising:
- filter media;
- mounting adhesive disposed on a first side of the filter media and having an opening to permit fluid flow through the filter media;
- a porous layer mounted on an opposing second side of the filter media and extending to an edge of the filter;
- and
- a cover layer mounted over the porous layer and forming a boundary for fluid flowing through the porous layer;
- wherein the filter is configured and arranged for flow of fluid from the opening in the mounting adhesive, through the filter media, into the porous layer, along the porous layer, and out through the edge of the filter.
Dependencies are inferred from the claim text.