ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,941, issued on June 17, was assigned to Osaka Gas Co. Ltd. (Osaka, Japan).

"Operation method for hydrogen production device, and hydrogen production device" was invented by Hinako Matsuo (Osaka, Japan), Hidaka Asonuma (Osaka, Japan) and Koichiro Ikeda (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "When the product gas producing operation is stopped, a stand-by operation is executed in which a product gas filling up a reforming processing unit is circulated, in a state in which an adsorbent of adsorption towers is maintained in a state in which adsorption target components are desorbed, and the heating of a reformer by a heating burner ...