This invention is to an anti-virus filter which may included in a facemask, personal protective equipment, respirator or ventilator to protect against airborne pathogens including the novel coronavirus. It is comprised of one or more anti-virus layers comprising a superabsorbent polymer which converts to a hydrogel upon addition of a water solution containing soap or detergent. The anti-virus layer is enclosed between an outer layer and an inner layer both of which are permeable to air but impermeable to water.

A method for fluorinating a filter for a pipette tip, the filter being made of a solid porous structure made of polyolefin. The method comprises the following steps: (a) placing the filter in an enclosure, (b) creating a vacuum in the enclosure, and (c) bringing the filter into contact with a fluorination agent injected into the enclosure in a gaseous state, the fluorination agent being made up of difluorine F.sub.2, the difluorine F.sub.2 being injected into the enclosure at a partial pressure between 100 Pa and 10000 Pa and step (c) being done at a temperature between 0 C. and 100 C. A pipette tip comprising a filter modified by the fluorination method, a method for producing such a tip, as well as a withdrawing pipette equipped with such a tip.

Described herein are devices and components for same, e.g., filters cartridges, which are able to filter contaminants while allowing active ingredients, e.g., nicotine, to pass through.

The present invention solves the problem of environmental pollution created by animal waste and converting animal waste to reusable water in the earth. The invention does this by a device that is capable of receiving animal waste and breaking down the waste into different components by the help of a decomposing catalyst such as a septic pack, filtering the resulting solution and finally producing a filtered liquid that enters the earth being cleansed by the process. The present invention comprises a filter device, a tank unit, a filter unit, a first opening positioned on a top surface of the tank unit; a second opening positioned on a bottom surface of the tank unit; wherein the tank unit is capable of receiving animal waste through the first opening; at least one hole at a bottom surface of the filter unit; wherein the tank unit is placed over the filter unit.

A method for fluorinating a filter for a pipette tip, the filter being made of a solid porous structure made of polyolefin. The method comprises the following steps: (a) placing the filter in an enclosure, (b) creating a vacuum in the enclosure, and (c) bringing the filter into contact with a fluorination agent injected into the enclosure in a gaseous state, the fluorination agent being made up of difluorine F.sub.2, the difluorine F.sub.2 being injected into the enclosure at a partial pressure between 100 Pa and 10000 Pa and step (c) being done at a temperature between 0? C. and 100? C. A pipette tip comprising a filter modified by the fluorination method, a method for producing such a tip, as well as a withdrawing pipette equipped with such a tip.

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. (340T.sub.p345) 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.

The present invention provides a method for producing a filter element that does not have any peeling of fine particles constituting a dust collection layer, and maintains high performance for long periods of time even when scaled up. The method includes depositing to form a layer of fine particles including low melting fine particles and small diameter fine particles, on a surface of a filter element material while suctioning the filter element material, and heating the layer of the fine particles by using a heater such as an infrared heater or an oven to sinter the fine particles to form the dust collection layer.