On the 18th of March 2014 Cryomech Inc and Dr. Chao Wang were issued United States Patent no. 8,671,698 for the Gas liquefier invented by Dr. Chao Wang.
The Cryomech Liquid Helium Plant (gas liquefier) has been on the market since 2007. In 2013 Cryomech launched their second generation that included higher liquefaction rates and a new touchscreen user-interface with remote monitoring.
There are more than 130 Liquid Helium Plants in operation on six continents.