Patent ID: 6889726

Claim:
An apparatus for providing oxygen-enriched gas for use by a patient in the form of a portable tank of the oxygen-enriched gas, said apparatus comprising: an oxygen concentrator for providing oxygen-enriched gas, said concentrator having a first output and a second output; a compressor connected in fluid communication with said first output of said concentrator for compressing oxygen-enriched gas provided by said concentrator, said compressor having an output; a coupling connected in fluid communication with said output of said compressor, said coupling adapted to be connected with a portable tank to enable filling of the portable tank with compressed oxygen-enriched gas from the compressor; and a reservoir connected in fluid communication with said output of said compressor for receiving compressed oxygen-enriched gas from said compressor; said reservoir being connected in fluid communication with said coupling to enable flow of compressed oxygen-enriched gas from said reservoir to said coupling to enable filling of the portable tank with compressed oxygen-enriched gas from said reservoir.