Patent ID: 7780040

Claim:
A particle dispenser cartridge comprising a dispenser nozzle, the dispenser nozzle comprising a dispenser nozzle outer surface and one or more sealing ribs extending from said dispenser nozzle outer surface and surrounding an included particle dispenser cartridge nozzle opening, the dispenser nozzle arranged to engage a shutter, the shutter arranged to slide over the one or more sealing ribs, thus sealing the particle dispenser cartridge nozzle opening, the dispenser nozzle further arranged so that when the particle dispenser cartridge rotates about the particle dispenser cartridge axial in a shutter-opening or leading direction (X) with respect to the shutter, the one or more sealing ribs move in a like direction with respect to the shutter, thus unsealing the particle dispenser cartridge nozzle opening; the dispenser nozzle comprising a first dispenser nozzle outer shutter rail extending from said dispenser nozzle outer surface on an inboard side of the one or more sealing ribs and a second dispenser nozzle outer shutter rail extending from said dispenser nozzle outer surface on the opposite outboard side of the one or more sealing ribs, each of the first and second dispenser nozzle outer shutter rails comprising a height from said dispenser nozzle outer surface that at least equals a height from said dispenser nozzle outer surface of the sealing ribs and a leading rail end that extends beyond the leading edge of the one or more sealing ribs in the shutter-opening direction (X), said first and second outer shuttle rails biasing said sealing ribs away from said shutter.