ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,726,748, issued on Sept. 1, was assigned to Beijing Zitiao Network Technology Co. Ltd. (Beijing).
"Strap assembly of head-mounted device, head-mounted device" was invented by Haigang Li (Beijing) and Zishang Wang (Beijing).
According to the abstract* released by the U.S. Patent & Trademark Office: "A strap assembly for a head-mounted device and a head-mounted device. The strap assembly of the head-mounted device includes: a fixed shell; a strap shell rotatably arranged on the fixed shell; a speaker arranged inside the strap shell. The speaker and the strap shell define a front sound cavity and a rear sound cavity that are spaced apart. The strap shell has a sound outlet hole that is ...