ALEXANDRIA, Va., June 4 -- United States Patent no. 12,322,991, issued on June 3, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).

"Battery pack and an adapter with a voltage conversion circuit" was invented by Qing Gao (Nanjing, China), Hong Zhu (Nanjing, China) and Zhijian Lu (Nanjing, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A combination includes a battery pack and an adapter. The battery pack includes a battery pack interface at least capable of being detachably connected to a power tool. A first adapter includes a plug, an alternating current input interface, an alternating current-direct current conversion circuit, and a direct current output interface. A second adapter ...