Patent ID: 7150777

Claim:
A method for recovering by product gases in vacuum metal treatment process or other treatment processes comprising the steps of: a) charging a load into a chamber; b) introducing an inert gas into the chamber at a controlled pressure; c) filling the chamber with the gas and circulating said gas inside the chamber; d) flowing the gas to a receiver and maintaining said receiver at a constant pressure; e) continuing the flow of gas into the receiver by a vacuum pump system; f) transferring the gas at constant pressure from the receiver to a storage tank at a high pressure; g) recovering the gas for reuse; wherein the gas in step (c ) passes through a first heat exchanger at every cycle to maintain a low temperature of the gas and the load; and h) maintaining the constant pressure of the receiver by varying its volume and using a second heat exchanger which reduces the temperature of the gas before being fed into the receiver.