ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,742,516, issued on Sept. 22, was assigned to Ardent Underground Pty Ltd (New South Wales, Australia).

"Compressed gas storage tank, system and method" was invented by John Zeni (Littleton, Australia), Keith Lovegrove (Narrabundah, Australia) and David Bentley (Maroubra, Australia).

According to the abstract* released by the U.S. Patent & Trademark Office: "A storage tank 10 comprises a first chamber 14 configured to store a first gas 18 under pressure. The first chamber 14 is defined by a first wall 20 and is arranged within a surrounding structure 12. The storage tank also comprises a flexible membrane 22 provided between the first wall 20 and the surrounding structure 12. A second...