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US 12,233,367 B2Granted
Filter media, elements, and methods
AssigneeDonaldson Company, Inc.
InventorsQiong Gao, Richard Patrick DeJong, Gregory S. Tronnes, Jason A. Tiffany, Giancarlo M. Izzi
Life of this patent
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Abstract
Fibrous filter medium that includes a surface-loading filter layer comprising fine fibers having an average diameter of less than 1 micron; a depth loading filter layer; and a support layer; wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.
Claims20
A gas filter medium comprising:
- a surface loading filter layer;
- a depth loading filter layer comprising glass fibers and multi-component binder fibers, the depth loading filter layer displaying a DEHS filtration efficiency of at least 55% at 0.4 micron size particles and 2 cm/s and a salt loading capacity of at least 1 g/m2 at 500 Pascals pressure rise over initial;
- and
- a support layer;
- wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer,
- wherein the gas filter medium has a filter medium has a thickness of 0.25 mm to 1.5 mm.
3 more elements
A gas filter medium comprising:
- a surface loading filter layer;
- a depth loading filter layer comprising glass fibers and multi-component binder fibers, the depth loading filter layer displaying a DEHS filtration efficiency of at least 55% at 0.4 micron size particles and 2.1 cm/s and a salt loading capacity of at least 1 g/m2 at 500 Pascals pressure rise over initial;
- and
- a support layer having a Gurley stiffness of 1000 milligrams or more;
- wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.
2 more elements
Dependencies are inferred from the claim text.