Microorganism-removing filter medium having high isoelectric material and low melt index binder
First Claim
Patent Images
1. A filter medium capable of removing microorganisms from a fluid, comprising:
- particles of activated carbon;
particles of a substantially insoluble inorganic material having an isoelectric point greater than a pH of a fluid being filtered, the particles of inorganic material mixed together with the particles of activated carbon; and
a binder for binding the particles of activated carbon and particles of inorganic material, the binder having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D1238 at 190 degrees C. and 15 kilograms load.
1 Assignment
0 Petitions
Accused Products
Abstract
A filter medium capable of removing microorganisms from a fluid such as water. The filter medium includes particles of activated carbon, particles of a substantially insoluble inorganic material having an isoelectric point greater than the fluid being filtered. A low melt index binder, preferably with a melt index of less than about 1 gram per 10 minutes, binds the particles of activated carbon and particles of inorganic material, such that the binder will become tacky at elevated temperatures without becoming sufficiently liquid to substantially wet the particles of activated carbon and inorganic material.
246 Citations
56 Claims
-
1. A filter medium capable of removing microorganisms from a fluid, comprising:
-
particles of activated carbon; particles of a substantially insoluble inorganic material having an isoelectric point greater than a pH of a fluid being filtered, the particles of inorganic material mixed together with the particles of activated carbon; and a binder for binding the particles of activated carbon and particles of inorganic material, the binder having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D1238 at 190 degrees C. and 15 kilograms load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 35)
-
-
27. A filter medium capable of removing microorganisms from a fluid, comprising:
-
particles of activated carbon; particles of magnesium hydroxide; and a binder for binding the particles of activated carbon and inorganic material, the binder having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load.
-
-
28. A filter medium capable of removing microorganisms from a fluid, comprising:
-
particles of activated carbon; particles of a substantially insoluble inorganic material having an isoelectric point greater than about 9.0 pH, the particles of organic material mixed together with the particles of activated carbon; and an ultra high molecular weight polyethylene binder for binding the particles of activated carbon and inorganic material, the binder having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load.
-
-
29. A filter medium capable of removing microorganisms from a fluid, comprising:
-
particles of activated carbon; particles of magnesium hydroxide; and an ultra high molecular weight polyethylene binder for binding the particles of activated carbon and magnesium hydroxide, the binder having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load. - View Dependent Claims (30, 31)
-
-
32. A filter medium capable of removing microorganisms from a fluid, comprising:
-
particles of activated carbon; particles of a substantially insoluble inorganic material having an isoelectric point greater than about 7.0 pH, the particles of organic material mixed together with the particles of activated carbon; and a binder for binding the particles of activated carbon and particles of inorganic material, the binder having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D 1238 at 190 degrees C. and 15 kilograms load.
-
-
33. A filter medium capable of removing microorganisms from a fluid, comprising:
-
granular activated carbon; a material providing an inorganic cation having an isoelectric point greater than a pH of a fluid being filtered; and a binder for binding the granular activated carbon and material providing the inorganic cation; wherein a percentage concentration of the inorganic cation times pressure drop through the filter medium in pounds per square inch is at least about 0.5 [g Mg·
lb]/[g filter in2].
-
-
34. A granular filter medium capable of removing microorganisms from a fluid, comprising:
-
particles of activated carbon; and particles of a substantially insoluble inorganic material having an isoelectric point greater than about 9.0 pH, the particles of organic material mixed together with the particles of activated carbon.
-
-
36. A method for forming a filter medium capable of removing microorganisms from a fluid, comprising:
-
mixing particles of activated carbon, particles of a substantially insoluble inorganic material having an isoelectric point greater than a pH of a fluid being filtered, and a binder, thereby forming a mixture; heating the mixture such that the binder becomes tacky without becoming sufficiently liquid to substantially wet the particles of activated carbon and inorganic material; and compressing the heated mixture for setting a pore size of pores formed by the particles and binder, a mean pore size after compression being between 0.01 micron and 10 microns. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
-
-
54. A device for removing microorganisms from water in the event of a bioterrorism attack, comprising:
-
a housing; and a filter medium positioned in the housing, the filter medium comprising; particles of activated carbon; particles of a substantially insoluble inorganic material having an isoelectric point greater than about 9.0 pH, the particles of material mixed together with the particles of activated carbon; and a binder for binding the particles of activated carbon and particles of inorganic material, the binder having a melt index of less than about 1 gram per 10 minutes as determined by ASTM D1238 at 190 degrees C. and 15 kilograms load. - View Dependent Claims (55, 56)
-
Specification