Edwards Limited

Geoffrey Young

Andrew James Seeley

Christopher Mark Bailey

Duncan Michael Price

Gary Peter Knight

Michael Andrew Galtry

Richard A Hogle

Kenneth Allen Aitchison

David Engerran

Michael Alan Eric Wilders

Liquid ring pumps are used to pump a variety of fluid types. Corrosive fluids are easily handled by the work fluid but can cause corrosion of pumping mechanisms. The present invention provides a magnetically driven liquid ring pump with corrosion resistant pumping mechanisms which achieves a longer time between service intervals.

Liquid ring pump

A method is described of treating a gas stream exhausted from an atomic layer deposition (ALD) process chamber to which two or more gaseous precursors are alternately supplied. Between the process chamber and a vacuum pump used to draw the gas stream from the chamber, the gas stream is conveyed to a gas mixing chamber, to which a reactant is supplied for reacting with one of the gaseous precursors to form solid material. The gas stream is then conveyed to a cyclone separator to separate solid material from the gas stream. By deliberately reacting a non-reacted precursor to form solid material upstream from the pump, reaction within the pump of the non-reacted precursor and a second non-reacted precursor subsequently drawn from the chamber by the pump can be inhibited.

Method of treating a gas stream

Growing community of inventors

Clevedon, United Kingdom

Geoffrey Young