The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1996
Filed:
Jan. 23, 1995
Applicant:
Inventors:
Arthur W Johnston, Atlanta, GA (US);
Arthur F Johnston, Atlanta, GA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210266 ; 210282 ; 210489 ;
Abstract
A multiple stage filter having an extended useful life comprising a first stage having granulated activated carbon enclosed by multiple filter wafers, the filter wafer comprising a number of filter media having pore size ranging from 0.45 microns to 5 microns, and a second stage comprising a filter membrane having pore size of 0.2 microns or less and a surface area of several square feet, such that greater than 99 percent of particulates greater than 0.5 microns are removed in the first stage and greater than 99.9 percent of the bacteria and cysts are removed in the second stage.