ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,439,197, issued on Oct. 7, was assigned to HONOR DEVICE Co. LTD. (Shenzhen, China).

"Earphone" was invented by Chuanguo Wang (Shenzhen, China), Chienfeng Yeh (Shenzhen, China), Yunhai Li (Shenzhen, China), Haihong Zhang (Shenzhen, China) and Yonghua Zhang (Shenzhen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "An earphone, including: a housing, a first speaker unit, a second speaker unit. The housing has a sound output hole. The first speaker unit and the second speaker unit are separately independently fastened in the housing. The first speaker unit produces a sound toward the sound output hole. The second speaker unit is located on a side that ...