ALEXANDRIA, Va., July 15 -- United States Patent no. 12,662,993, issued on June 23, was assigned to IDEA INVENT EVOLVE PTY LTD (Tamborine Mountain, Australia).

"Energy storage device with a variable volume chamber" was invented by Scott Howison (Queensland, Australia), Sven Du Clou (Queensland, Australia) and Samuel Mccarthy (Queensland, Australia).

According to the abstract* released by the U.S. Patent & Trademark Office: "A mechanical energy storage device comprising an expandable and contractable, sealed primary chamber with a sealed variable internal volume containing an expandable/compressible primary fluid. An external medium or a secondary chamber that resists expansion of the primary chamber surrounds the primary chamber. An input...