ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,435,541, issued on Oct. 7, was assigned to Zhejiang Hanyun Hardware Co. Ltd. (Quzhou, China).
"Lockset and door lock" was invented by Haisheng Tan (Hangzhou, China) and Jun Ma (Hangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A lockset and a door lock belong to the technical field of door locks. The lockset includes a drive shaft. Two ends of the drive shaft are respectively connected to handle assemblies. The handle assembly includes a handle and a lock seat. A linkage mechanism is provided between the handle of one of the handle assemblies and the drive shaft, and is configured to lock the handle and the drive shaft such that the handle a...