Patent ID: 7955407
Filing Date: 2011-06-07
Classification: B01D

Abstract:
1. A fluid filter comprising an upstream side where fluid enters and a downstream side where fluid exits, said filter being formed of filaments and being in bag form, said filaments near said upstream side having a greatest thickness within said filter, said filaments continuously and gradually decreasing in thickness from said upstream side toward said downstream side such that pores between said filaments are largest near said upstream side, gradually decreasing in thickness toward said downstream side, thereby allowing particles of different sizes to be separated and evenly distributed throughout the filter, some of said filaments being cohesively bonded, said filaments having greatest rigidity within said filter near said upstream side, said filaments continuously and gradually decreasing in rigidity from said upstream side toward said downstream side to form a sidewall of said filter having sufficient stiffness so as not to require additional structural support to maintain its shape, said filaments varying progressively in transverse dimension.