ALEXANDRIA, Va., June 9 -- United States Patent no. 12,288,905, issued on April 29, was assigned to ZHEJIANG UNIVERSITY (Hangzhou, China).

"Online observation method of anode nitrogen concentration for proton exchange membrane fuel cell" was invented by Jian Chen (Hangzhou, China), Zhiyang Liu (Hangzhou, China) and Chizhou Yan (Hangzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "An online observation method of an anode nitrogen concentration for a proton exchange membrane fuel cell is disclosed. Firstly, a dynamic model of anode nitrogen concentration is established based on a gas transmembrane penetration model and an anode material conservation model of a fuel cell, and then an average voltage d...