Seamless tubular nonwoven webs and filters thereof
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Corrugated filter arrangement with support layer and flow channels Patent #: 5084178
ApplicationNo. 176274 filed on 12/30/1993
US Classes:210/232, WITH REPAIR OR ASSEMBLING MEANS55/500, Flexible sheet type maintained in nonplanar configuration55/521, ZIGZAG, CORRUGATED, OR CONICAL55/527, Fibrous or strand form210/484, Medium within foraminous supporting container or sheath210/489, For series flow210/493.5, Filter element210/494.1, Convolute210/496, Bound, fused or matted, e.g., porous shapes, sponges, etc.210/497.2Filter blank
ExaminersPrimary: Dawson, Robert A.
Assistant: Walker, W. L.
Attorney, Agent or Firm
Foreign Patent References
International ClassB01D 027/06
AbstractA porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibres which are free of fibre-to-fibre bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.
Field of SearchWITH REPAIR OR ASSEMBLING MEANS
Medium within foraminous supporting container or sheath
For series flow
Bound, fused or matted, e.g., porous shapes, sponges, etc.
Flexible sheet type maintained in nonplanar configuration
ZIGZAG, CORRUGATED, OR CONICAL
Fibrous or strand form