Water filter device

Claim 2

A water filtering cartridge adapted to be removably received within a water filtering chamber of a water filtering device secured to the end of a faucet, said water filtering cartridge comprising a housing open at one axial end thereof for reception of the water to be filtered and having at the other axial end thereof a wall with openings therein for exit of the water from said cartridge, a filtering layer in said housing adjacent the open axial end thereof containing particles of activated charcoal, a filtering membrane adjacent said annular wall having a pore size of from about 0.2 to 0.5 microns, and an intermediate filtering layer between said first mentioned layer and said membrane, said intermediate layer having a pore size of from about 1 to 10 microns and less than the particle size of said charcoal.

Claim 3

A water filtering cartridge as set forth in claim 1 wherein the particle size of said charcoal particles is from about 5 to 50 microns.

Claim 4

A water filtering cartridge as set forth in claim 2 wherein said first mentioned layer has a pore size of from about 20 to 50 microns.

Claim 5

A water filtering cartridge as set forth in claim 3 wherein said first mentioned filtering layer comprises fibrous material impregnated with said activated charcoal particles.

Claim 6

A water filtering cartridge as set forth in claim 4 wherein said first mentioned layer consists of a plurality of layers each of a fibrous material impregnated with said charcoal particles.

Claim 7

A water filtering cartridge as set forth in claim 1 wherein said intermediate layer has a thickness of from about 200 to 800 microns.

Claim 8

A water filtering cartridge as set forth in claim 6 wherein the intermediate layer is a fibrous material.

Claim 9

A water filtering cartridge as set forth in claim 6 wherein the thickness of said first mentioned layer is from about 0.1 to 0.2 inches, and wherein the thickness of said membrane is from about 100 to 250 microns.

Claim 10

A water filtering cartridge as set forth in claim 1 wherein said wall of said housing is a grid having crossing portions each with a pointed cross-section that points toward said membrane.

Claim 11

A water filtering cartridge as set forth in claim 1 wherein said membrane is secured to said housing in watertight sealed relationship therewith.

Claim 12

A water filtering cartridge as set forth in claim 1 wherein over said first mentioned filtering layer at the open end of said housing there is a porous layer having a pore size greater than that of said intermediate layer.

Claim 13

A water filtering cartridge adapted to be removably received within an annular water filtering chamber of a water filtering device secured to the end of a faucet, said water filtering cartridge comprising an annular housing having inner and outer walls, said housing being open at one axial end thereof for reception of the water to be filtered and having at the other axial end thereof an annular wall with openings therein for exit of the water from said cartridge, an annular filtering layer in said housing adjacent the open axial end thereof comprising a fibrous material impregnated with particles of activated charcoal of a size of from about 5 to 50 microns, said filtering layer having a pore size of from about 20 to 50 microns, an annular filtering membrane adjacent said annular wall having a pore size of from about 0.2 to 0.5 microns, said filtering membrane being secured in sealed watertight relationship to the inner and outer walls of said housing, and an annular intermediate filtering layer between said first-mentioned layer and said filtering membrane, said intermediate layer having a pore size which is from about 1 to 10 microns and which is less than the particle size of said charcoal particles.

Claim 14

A water filtering cartridge adapted to be removably received within an annular water filtering chamber of a water filtering device secured to the end of a faucet, said water filtering cartridge comprising an annular housing having inner and outer walls, said housing being open at one axial end thereof for reception of the water to be filtered and having at the other axial end thereof an annular wall with openings therein for exit of the water from said cartridge, an annular filtering layer in said housing adjacent the open axial end thereof comprising a fibrous material impregnated with particles of activated charcoal of a size of from about 5 to 50 microns, said filtering layer having a pore size of from about 20 to 50 microns, an annular filtering membrane adjacent said annular wall having a pore size of from about 0.2 to 0.5 microns, said filtering membrane being secured in sealed watertight relationship to the inner and outer walls of said housing, and an annular intermediate filtering layer between said first-mentioned layer and said filtering membrane, said intermediate layer having a pore size which is from about 1 to 10 microns and which is less than the particle size of said charcoal particles.