ALEXANDRIA, Va., July 21 -- United States Patent no. 12,686,588, issued on July 21.
"System and method for hydraulic-pneumatic drive with energy storage for elevators" was invented by Dan Davidian (Rosh Ha'ayan, Israel), Yair Moshe Holland (Ra'anana, Israel) and Avinoam Livni (Haifa, Israel).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power drive for a passenger and/or cargo elevator-or any conveyance-using stored high pressure compressed air as a primary source, producing high pressure hydraulic fluid energy to move a servo-controlled hydraulic motor, mechanically connected to the hoisting mechanism of the elevator, is disclosed. The electric power driving the air compressor is not affected by the load ...