ALEXANDRIA, Va., March 17 -- United States Patent no. 12,575,604, issued on March 17, was assigned to SHENZHEN FIRST UNION TECHNOLOGY Co. LTD. (Shenzhen City, China).

"Smoking set control circuit and smoking set" was invented by Wenjuan Li (Shenzhen, China), Xiaogang Fang (Shenzhen, China), Peixia Yu (Shenzhen, China), Zhongli Xu (Shenzhen, China) and Yonghai Li (Shenzhen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A smoking set control circuit for a smoking set includes: a power circuit first and second sampling circuits; a voltage regulating circuit having power tubes; a microcontroller configured to: control the power tubes to work at a plurality of different preset switching frequencies; acquir...