ALEXANDRIA, Va., March 3 -- United States Patent no. 12,566,154, issued on March 3, was assigned to INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES (Beijing).

"Purification system for nitrogen gas and xenon gas in water and isotope static analysis method thereof" was invented by Ziheng Liu (Beijing), Jiannan Li (Beijing), Fei Su (Beijing) and Huaiyu He (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "A purification system for nitrogen gas and xenon gas in water and a static isotopic analysis method thereof are provided. The system includes a sample container, a carbon dioxide ice cold trap, a gas delivery main pipe and a mass spectrometer for noble gas communicated sequentially. The g...