Patent ID: 7387216

Claim:
A pipetting apparatus for transferring an internal calibrated volume of fluid having a wiping cap device for removing all non-calibrated residue fluid attached to the smooth conical shaped outside surface of a pipette tip during fluid transfer from a container, the wiping cap device comprising: a tubular member having an open end; a wiping cap including a base and a cup shaped member, said wiping cap coupled to said open end of said tubular member, said cup shaped member comprising a conical resilient wiper section extending to a conical tip, said wiper section getting smaller in the direction away from said open end to create a substantial closure at the conical tip of said wiper section and being configured to include at least one helically formed slot extending from said substantial closure forming a wiper finger, said wiper finger rotating substantially more than one revolution and being adapted to be unobstructed and resiliently held in complete circumferential contact against said outside surface of said pipette tip inserted therethrough including squeegee like means to remove all said residue fluid attached to said smooth outside surface when said pipette tip is withdrawn axially through said wiper finger whereby said outside surface has said residue fluid removed and leaving said internal calibrated fluid within said pipette tip for fluid transfer; and said wiping cap including means for securing said wiping cap to said tubular member.