ALEXANDRIA, Va., July 21 -- United States Patent no. D1,135,419, issued on July 21, was assigned to Zhongshan M-Castle Childrens Product Co. LTD. (Zhongshan, China).
"Playpen" was invented by Jinwen Xu (Zhongshan, China) and Jingxin Zhang (Zhongshan, China).
The patent was filed on Nov. 25, 2024, under Application No. D/974,872.
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