ALEXANDRIA, Va., July 21 -- United States Patent no. 12,686,159, issued on July 21.
"Synthetic resin pipe manufacturing apparatus" was invented by Soon Sae Park (Cheonan-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to a synthetic resin pipe manufacturing apparatus including: an extruder configured to extrude a synthetic resin pipe through a blow molding portion; an air fitting formed in a cylindrical shape having the same inner diameter as the synthetic resin pipe and formed in front of an air supply pipe, which is formed inside the extruder; an air discharge plate disposed in front of the air ejection pipe and having a plurality of air discharge holes perfora...