Patent ID: 8590736

Claim:
A pipette tip dispensing device, comprising: (a) a sleeve; (b) an activator plate within the sleeve; (c) a distal barrier plate within the sleeve disposed opposite to and spaced away from the activator plate; (d) a plurality of nested pipette tip units between the activator plate and distal barrier plate, each of which nested pipette tip units is aligned with a channel in the distal barrier plate; which distal barrier plate comprises: a plurality of channels, each which channels has a diameter larger than the widest portion of a pipette tip; the plurality of channels comprising two or more different subsets of channels and each subset of channels is configured to eject tips at different times; a substantially flat top surface; and a substantially flat bottom surface comprising a plurality of projections around some or all of the channels; which plurality of projections around any one subset of channels are the same length and different subsets of channels comprise projections of different lengths.