Patent Number: 6,251,293

Title: Fluid dispensing system having independently operated pumps

Abstract: A fluid dispensing system is provided which has a first diaphragm pump, a filter connected to receive the discharge of said first pump, and an accumulator/second diaphragm pump connected to receive the discharge of said filter. Hydraulic fluids pumped by cylinder/piston/stepper assemblies independently actuate each of the diaphragm pumps, providing accurate, controllable and repeatable dispense of the subject fluid. The system further includes a suck-back device downstream of the second pump.

Inventors: Snodgrass; Ocie T. (Garland, TX), Farney; Michael K. (Irving, TX), Gibson; Gregory M. (Dallas, TX)

Assignee: Millipore Investment Holdings, Ltd.

International Classification: B01D 29/15 (20060101); B01D 29/13 (20060101); B01D 35/26 (20060101); B01D 35/00 (20060101); F04B 9/109 (20060101); F04B 43/06 (20060101); F04B 9/02 (20060101); F04B 9/00 (20060101); F04B 43/067 (20060101); F04B 7/00 (20060101); F04B 15/02 (20060101); F04B 15/00 (20060101); B01D 017/12 (); B67D 005/40 ()

Expiration Date: 06/26/2018