Extended area filter bag

Abstract

A bag-type filter adapted for use with a basket filter assembly. The basket assembly is removably supported within a filter vessel and includes an outer, permeable member and an inner, permeable member having a diameter which is less than the diameter of the outer, permeable member such that the inner, permeable member is received with in the outer, permeable member so as to define an annular space therebetween and an inner flow path. The bag-type filter is supported by the basket assembly over both the inner and outer permeable members bounding the annular space therebetween. The bag-type filter includes a first portion having a first, larger diameter and a second portion having a second, reduced diameter. A transition portion is disposed between the first and second portions of the bag-type filter.

I claim:  
     
         1 . A bag-type filter adapted for use in connection with a basket filter assembly, said bag type filter comprising: 
 a first portion having a first, larger diameter, a second portion having a second, reduced diameter and a transition portion disposed therebetween;    said bag type filter being adapted to be received on a basket assembly.    
     
     
         2 . A bag-type filter assembly as set forth in  claim 1  wherein said second, reduced diameter portion of said bag-type filter includes an arcuate, closed end, said first, larger diameter portion having an open end, said arcuate, closed end of said second, reduced diameter portion being positioned adjacent said open end of said first, larger diameter portion when the bag-type filter is supported by said basket assembly.  
     
     
         3 . A bag-type filter as set forth in  claim 1  wherein said transition portion includes a circular piece of material having an inner diameter and an outer diameter; said transition portion being attached to said first portion of said filter at said outer diameter of said transition portion and attached to said second portion of said filter at said inner diameter of said transition portion thereby forming a bridge therebetween.  
     
     
         4 . A bag-type filter as set forth in  claim 1  wherein said transition portion is defined by a reduced diameter segment of said bag-type filter.  
     
     
         5 . A bag-type filter as set forth in  claim 1  wherein said first, larger diameter portion has at least one open end, said second, reduced diameter portion includes an arcuate, closed end and at least one open end, said transition portion is substantially U-shaped in cross-section having an inner flange, an outer flange, and a bridge portion defined therebetween, and wherein said open end of said first, larger diameter portion is attached to said outer flange of said transition portion and said open end of said second, reduced diameter portion is attached to said inner flange of said transition portion.  
     
     
         6 . A bag-type filter as set forth in  claim 5  wherein said transition portion is an integral, one-piece, member being substantially U-shaped in cross-section.  
     
     
         7 . A bag-type filter as set forth in  claim 1  wherein said transition portion is defined by two L-shaped members attached to one another so as to be substantially U-shaped in cross-section.