| US 7,503,952 B2 | ||
| Filter element | ||
| Brian Lane, Hebburn (United Kingdom); and Raymond Francis Trowsdale, Consett (United Kingdom) | ||
| Assigned to Parker Hannifin Limited, Hemel Hempstead (United Kingdom) | ||
| Filed on Jan. 22, 2007, as Appl. No. 11/625,492. | ||
| Application 11/625492 is a continuation of application No. PCT/GB2005/002941, filed on Jul. 26, 2005. | ||
| Claims priority of application No. 0417462.9 (GB), filed on Aug. 05, 2004. | ||
| Prior Publication US 2008/0168903 A1, Jul. 17, 2008 | ||
| Int. Cl. B01D 46/00 (2006.01) | ||
| U.S. Cl. 55—476 [55/418; 55/498; 210/437; 210/440; 210/443; 210/457] | 21 Claims |
| 1. A filter element for removing material that is entrained in a gas stream, which comprises:
a wall of a filtration medium which defines a hollow space, for a gas stream to flow from the space through the wall, and
an end cap having an inlet tube extending into the hollow space for a gas stream to be supplied to the space, the inlet tube
having a side wall extending between an upstream open end and a downstream open end, with at least one opening in its side
wall,
in which the inlet tube has an upstream band, a middlestream band and a downstream band, the said bands being axially adjacent
to one another and non-overlapping, having equal axial lengths of at least 5% of the length of the inlet tube, and being arranged
such their planes are perpendicular to the axis of the inlet tube, and in which the proportion of the area of the side wall
that is open in the upstream band is smaller than that in the middlestream band, and the proportion of the area of the side
wall that is open in the middlestream band is smaller than that in the downstream band.
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