ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,705, issued on Nov. 18, was assigned to Zhengzhou Wanmayun Electronic Technology Co. Ltd. (Zhengzhou, China), HONGFUJIN PRECISION ELECTRONICS (ZHENGZHOU) Co. LTD. (Zhengzhou, China) and HON HAI PRECISION INDUSTRY Co. LTD. (New Taipei, Taiwan).

"Sel-reporting monitor for integrity and conditions of manhole cover" was invented by Hong Liu (Zhengzhou, China) and Xi-Juan Luo (Zhengzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A monitor for monitoring the conditions of and around and under a manhole cover senses current conditions of the manhole cover and enables wireless self-reporting of such conditions at intervals and upon certain emerge...