Patent ID: 11872552
Assignee: BECKMAN COULTER, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B  G

Claim 0:
1. A device for transferring liquid comprising:
a piston comprising a stepped profile, a drive rod portion, and a free end portion extending from the drive rod portion, the free end portion having a different diameter than the drive rod portion;
a barrel comprising a barrel body, and a tip formed in the barrel body, the barrel comprising a larger diameter segment and a smaller diameter segment, wherein the barrel is configured to engage a first pipette tip sized to fit over the larger diameter segment, and wherein the barrel is further configured to engage a second pipette tip sized to fit over the smaller diameter segment of the barrel; and
a first seal element between and engaging the barrel and the free end portion;
wherein the barrel comprises a stepped bore defined by the barrel body, the stepped bore comprising an axial hole passing through the tip, the stepped bore further comprising a coaxial counterbore and a bore portion having a diameter that is smaller than a diameter of the counterbore and is larger than a diameter of the axial hole, and wherein the first seal element is fixed to the stepped bore within the bore portion.