Patent ID: 8728308

Claim:
A filter comprising: an elongated filter envelope having a port end and a loop end opposite the port end, the filter envelope enclosing an inner pocket, the inner pocket being configured to receive fluid filtered by the filter envelope, the filter envelope having a bent position defined by a port portion of the filter envelope including the port end and a loop portion of the filter envelope including the loop end, the loop portion and the port portion at least partially overlapping each other; filter material disposed in the pocket; and a port attached to the filter envelope proximate the port end, the port being configured to be connected to a hydraulic device and to allow fluid to be released from the pocket; the filter envelope having a periphery with a sealed rim and a slit splitting a portion of the rim so as to form a flexible retention element unitarily attached to the loop portion of the filter envelope, the retention element being positioned around one of the port and the port portion of the filter envelope to retain the filter envelope in the bent position.