Patent ID: 7112120

Claim:
A feeder configured to transport blast media from a source into a flow of transport gas, said feeder comprising: a) a rotor having a circumferential surface, said rotor being rotatable about an axis of rotation; b) a plurality of pockets disposed in said circumferential surface, each of said plurality of pockets being cyclically disposed between a first position and a second position when said rotor is rotated about said axis; c) a transport gas flowpath, said transport gas flowpath having an inlet and an outlet, said inlet being configured to be connected to a source of transport gas; d) a seal having a first surface contacting at least a portion of said circumferential surface, said first surface having at least one first opening and at least one second opening spaced apart from each other, said at least one first opening being in fluid communication with said inlet, said at least one second opening being in fluid communication with said outlet; and e) said transport gas being able to flow from said at least one first opening to said at least one second opening through those of said plurality of pockets disposed between said first and second positions.