ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,020, issued on June 24.
"Vacuum air extraction device with high practicality and reliability" was invented by Haoyu Liu (Puning, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a vacuum air extraction device with high practicality and reliability. The vacuum air extraction device with high practicality and reliability includes an air extraction host machine and a vacuum sucker in matching connection to a lower part of the air extraction host machine, where a control circuit board, a vacuum air pump and a decompression valve are arranged in the air extraction host machine; an annular groove body is formed in one en...