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US 11,596,889 B2Granted
Air filter and method of use
AssigneePall Corporation
InventorsJonathan M. Kent, Paul D. Roux
Life of this patent
Estimating the term…
Abstract
Air filters, and air filter devices for use in helicopters, and methods of use, are disclosed.
Claims17
An air filter comprising
- (a) a pleated first porous medium having a plurality of pleats, each pleat having a base and a peak, comprising a hydrophobic porous fibrous medium having a first surface and a second surface, and a plurality of apertures having a diameter in the range of from 2 mm to 35 mm in the first medium, the plurality of apertures passing through the first and second surfaces, wherein all of the plurality of apertures are arranged closer to the bases of the pleats than to the peaks of the pleats;
- and,
- (b) a plurality of second porous media, each second porous medium comprising a hydrophilic porous fibrous medium having a first surface and a second surface, wherein the plurality of second porous media are mounted to the first or second surfaces of the first porous medium, the second porous media covering the plurality of apertures of the first porous medium.
An air filter device comprising:
- an air filter comprising:
- a) a pleated first porous medium having a plurality of pleats, each pleat having a base and a peak, comprising a hydrophobic porous fibrous medium having a first surface and a second surface, and a plurality of apertures having a diameter in the range of from 2 mm to 35 mm in the first medium, the apertures passing through the first and second surfaces, wherein all of the plurality of apertures are arranged closer to the bases of the pleats than to the peaks of the pleats;
- and,
- (b) a plurality of second porous media, each second porous medium comprising a hydrophilic porous fibrous medium having a first surface and a second surface, wherein the plurality of second porous media are mounted to the first or second surfaces of the first porous medium, the second porous media covering the plurality of apertures of the first porous medium;
- and;
- a housing, wherein the air filter is arranged in the housing.
3 more elements
A method of filtering air passing into an engine of a helicopter, the method comprising passing air through an air filter comprising:
- (a) a pleated first porous medium having a plurality of pleats, each pleat having a base and a peak, comprising a hydrophobic porous fibrous medium having a first surface and a second surface, and a plurality of apertures having a diameter in the range of from 2 mm to 35 mm in the first medium, the apertures passing through the first and second surfaces, wherein all of the plurality of apertures are arranged closer to the bases of the pleats than to the peaks of the pleats;
- and
- (b) a plurality of second porous media, each second porous medium comprising a hydrophilic porous fibrous medium having a first surface and a second surface, wherein the plurality of second porous media are mounted to the first or second surfaces of the first porous medium, the second porous media covering the plurality of apertures of the first porous medium.
A method of making an air filter, the method comprising:
- (a) providing a plurality of apertures in a pleated first porous medium having a plurality of pleats, each pleat having a base and a peak, comprising a hydrophobic porous fibrous medium having a first surface and a second surface, and a plurality of apertures having a diameter in the range of from 2 mm to 35 mm in the first medium, the apertures passing through the first and second surfaces, wherein all of the plurality of apertures are arranged closer to the bases of the pleats than to the peaks of the pleats;
- and
- (b) mounting a plurality of second porous media, each second porous medium comprising a hydrophilic porous fibrous medium having a first surface and a second surface, wherein the plurality of second porous media are mounted to the first or second surfaces of the first porous medium, and wherein the second porous media cover the plurality of apertures of the first porous medium.
Dependencies are inferred from the claim text.