Patent ID: 6902704

Claim:
An injection pump assembly in a chemical delivery system for simultaneously delivering reagents into a combinatorial reactor system having multiple reactors, comprising: a plurality of injectors, each injector being in fluid communication with one of the multiple reactors, each injector having a pump with a barrel in which a plunger sealingly moves to ingest, store and discharge a flushing solvent; a pipette assembly for loading, storing, and discharging one or more reagents and the flushing solvent into one of the reactors in the combinatorial reactor system, the pipette assembly comprising a passage a first reservoir for retaining at least some of the reagents; a second reservoir also for retaining at least some of the reagents, the passage being in fluid communication with each reservoir; one or more hollow needles that extend along the passage for selectively delivering a reagent to the first or the second reservoir; a first valve positioned downstream of the first reservoir; a second valve positioned downstream of the second reservoir; so that when each valve is in a closed position, the reagents can be stored in isolation from each other and when each valve is in an open position, the reagents and the flushing solvent may flow along the passage; a 3-way valve positioned between the pump and the pipette assembly, the 3-way valve having a first inlet port that receives the flushing solvent; a second port connected to the pump for ducting the flushing solvent to and from the pump; and a third port connected to the passage for ducting the flushing solvent from the pump; and an actuator assembly in operable communication with each of the plurality of injectors so that the 3-way valves of each injector may be repositioned in unison, the first valves may be repositioned in unison, and the second valves may be repositioned in unison, thereby delivering precise amounts of the flushing solvent and the reagents in varied or consistent amounts to each reactor in the combinatorial reactor system.