1
Guillermo P Pardinas: Pipette tip with self-aligning and self-sealing features. Abbott Laboratories, Frank S Ungemach, August 3, 1993: US05232669 (141 worldwide citation)

A pipette tip for use in automated assay testing systems includes an annular, protruding seal ring on the interior wall of the pipette for engaging a sealing surface on a probe to provide a resilient seal. The pipette tip also includes a positive stop for assuring proper positioning and alignment of ...


2
Dennis Pinkerton, Robert W Jaekel, Guillermo P Pardinas: Pump with multi-port discharge. Hoffmann & Baron, May 14, 1991: US05015157 (27 worldwide citation)

A valveless, positive displacement metering pump is provided which is capable of either mixing two or more fluids or dividing a fluid from an inflow line into two or more outflow lines. The pump includes a housing which contains a cylindrical working chamber at different radial positions. Three or m ...


3
Guillermo P Pardinas: Valveless metering pump with reciprocating, rotating piston. Abbott Laboratories, Frank S Ungemach, Priscilla E Porembski, Daniel W Collins, September 21, 1993: US05246354 (20 worldwide citation)

A valveless metering pump includes a simultaneously reciprocating and rotating piston. The pump head includes radially spaced coplanar ports for drawing and dispensing fluids as the piston rotates sequentially past the ports. The reciprocating stroke of the piston is controlled by adjusting the axis ...


4
Randall E Youngs, Guillermo P Pardinas: Control system for valveless metering pump. Abbott Laboratories, Richard D Schmidt, June 9, 1992: US05120199 (19 worldwide citation)

A control system for the working piston of a valveless metering pump for the precision delivery of fluids to a plurality of sequentially spaced output ports is adapted to control and alter the speed of rotation of the pump piston depending on predetermined angles of rotation of the piston as it cycl ...


5
Guillermo P Pardinas, Robert E Ennesser III: Method and apparatus for calibrating a multiple port pump. Abbott Laboratories, Richard D Schmidt, April 5, 1994: US05299446 (15 worldwide citation)

A method and apparatus for calibrating a multiple port metering pump includes a graduated scale mounted on the head of the pump and an indicator mounted on the body of the pump, whereby the angular orientation of a plurality of radially extending, sequentially spaced outlet ports may be adjusted rel ...


6