A porous metal body having a flat plate shape and having a three-dimensional network structure skeleton includes multiple cells, in which, when a ratio of a cell diameter in a thickness direction of the porous metal body to a cell diameter in a direction orthogonal to the thickness direction (cell diameter in thickness direction/cell diameter in direction orthogonal to thickness direction) is defined as a cell diameter ratio, formula (1) and formula (2) below are satisfied:

0.4≥cell diameter ratio≥1.0  formula (1)

0.50<cell diameter in direction orthogonal to thickness direction/(thickness of porous metal body/cell diameter ratio)≥1.50  formula (2)

A filtration filter comprises a metallic mesh having a circumferential shape and radially inner and outer portions. The metallic mesh is adapted to filter out a filtration target object contained in a fluid passing through the membrane. First and second frame members hold the outer portion there between so as to create first and second bent sections separated by a transition section extending between the first and second bent sections. The transition section includes at least one streaked projection.

A filtration filter comprises a metallic mesh having a circumferential shape and radially inner and outer portions. The metallic mesh is adapted to filter out a filtration target object contained in a fluid passing through the membrane. First and second frame members hold the outer portion there between so as to create first and second bent sections separated by a transition section extending between the first and second bent sections. The transition section includes at least one streaked projection.

A tetrafluoroethylene polymer is provided in an air filter medium having a pressure loss that can be reduced and made uniform at a plurality of positions. The tetrafluoroethylene polymer may also be provided in an air filter medium, a filter pack, or an air filter unit. The tetrafluoroethylene polymer has drawability and non-melt processability. The tetrafluoroethylene polymer has a ratio S.sub.2/S.sub.1 of 0.60 or more, where S.sub.2 represents an endotherm mJ/mg in a range of T.sub.0° C. or higher and 350° C. or lower, T.sub.0° C. is a temperature 2.5° C. lower than a temperature T.sub.p° C. (340≤T.sub.p≤345) at which a minimum point is given on a heat-of-fusion curve obtained by measuring an unbaked polymer for measurement having no history of heating to a temperature of 300° C. or higher using a differential scanning calorimeter at a temperature-increasing rate of 2° C./min, and S.sub.1 represents an endotherm mJ/mg in a range of 320° C. or higher and T.sub.0° C. or lower.

In one aspect, a material structure is disclosed, which includes a macroscopic porous substrate configured to receive a flow of a medium for passage of at least a portion thereof through the porous substrate. At least one porous coating is disposed on at least a portion of an inner surface of the porous substrate, wherein the porous coating comprises a matrix having a plurality of interconnected passages. The porous substrate and the coating are configured to treat at least one contaminant, if any, present in the flowing medium.

Embodiments of systems including and methods employing one or more porous filters to produce consumable extractions by processing at least partially soluble material(s) via solvent(s), including beverages. Other embodiments may be described and claimed.

A face mask and face mask filter system filters droplets and aerosols, and applies a treatment that causes viruses particles carried by droplets and aerosols to be rendered non-infectious by application of a low voltage electric field. Optionally, the face mask filter system includes an electric circuit operatively coupled to the face mask filter and configured to monitor and/or enhance treatment of virus particles.

An EM filter for an EGR cooler includes a gasket and a mesh filter including a horizontal wire and a vertical wire that are metal wires, wherein the horizontal wire and the vertical wire form a twill weave structure, and wherein a wire diameter of the horizontal wire with respect to a wire diameter of the vertical wire is greater than 1 and less than or equal to 1.3.

Within examples, a system to provide filtered air to an enclosure for a passenger of a vehicle is described that includes a collapsible canopy hood attachable to a support structure of a vehicle, and a filter unit mounted to the support structure of the vehicle and having an output coupled to the collapsible canopy hood. The filter unit includes an air filtration component to filter air that is then output to the collapsible canopy hood.

Within examples, a system to provide filtered air to an enclosure for a passenger of a vehicle is described that includes a collapsible canopy hood attachable to a support structure of a vehicle, and a filter unit mounted to the support structure of the vehicle and having an output coupled to the collapsible canopy hood. The filter unit includes an air filtration component to filter air that is then output to the collapsible canopy hood.