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US 6,103,119 AGranted
Filter cartridges having track etched membranes and methods of making same
AssigneeWhatman, Inc.
InventorsJames G. Clements, William Stephen Macomber, Suzanne Surprenant
Life of this patent
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Abstract
A filter cartridge that includes a track etched membrane sealed therein in a leak-free manner, and a method for making the cartridge. The filter cartridge has a bubble point that is at least 50% of the bubble point of the track etched membrane. In one embodiment, the method includes disposing the track etched membrane below a heat source and orienting the membrane so that it melts back on itself, and then allowing the membrane to cool to form a leak-free seal.
Claims31
A filter cartridge, comprising:
- a cartridge body;
- a polyester track etched membrane disposed within the cartridge body, that is arranged to form a filter element having an interior including at least one end, where the track etched membrane includes a plurality of pores, and at least one shadow region that is free of pores;
- and
- at least one leak-free seal that closes the at least one end of the interior of the filer element,
- wherein the track etched membrane is encapsulated by the at least one leak-free seal.
2 more elements
Dependencies are inferred from the claim text.