ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,529,391, issued on Jan. 20, was assigned to Central South University of Forestry and Technology (Changsha, China).

"Energy recovery system and control strategy for hydraulic excavator boom" was invented by Peng Hu (Changsha, China), Tao Wen (Changsha, China), Hui Chen (Changsha, China) and Kai Liao (Changsha, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "An energy recovery system and control strategy for a hydraulic excavator boom is provided. The energy recovery system includes an oil tank, an accumulator, and a first energy recovery cylinder, an energy utilization cylinder, and a second energy recovery cylinder that are sequentially arranged be...