Abstract: A system and method of transferring, by a patient, high purity gas from a supply source to a portable cylinder. The system comprises a regulator that operatively connects to the supply source that stores the high purity gas. A cylinder valve removeably connects with the outlet of the regulator while a residual pressure valve operatively connects to the cylinder valve. The residual pressure valve includes a chamber in communication with the cylinder valve, wherein a piston assembly separates the chamber into a high pressure area and a low pressure area. During a fill process, the portable cylinder removeably connects to the valve outlet such that the high purity gas flows directly into the chamber via the regulator and cylinder valve to slide the piston assembly within the chamber to allow the flow of the high purity gas through the chamber and into the portable cylinder.

Abstract: A method for finding a trading ad on a network includes steps of receiving a query, devising a query string from the query, sending the query string to a search engine of the network, searching via the search engine to find the trading ad, returning a search result by the search engine, sifting and extracting the trading ad from the search result, and matching and ranking the trading ad with respect to the query. A trader performs the steps of receiving, devising, sending, sifting and extracting, and matching and ranking. The trader is scalable such that the network can be the Internet, and the trader can be a computer software program.