ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,300, issued on Nov. 25.
"Easy-to-clean sewer pipe connecting pipe assembly" was invented by Haichao Li (Zhejiang, China) and Zhengxing Li (Zhejiang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sewer pipe connecting pipe assembly, comprising a telescopic pipe, wherein one end of the telescopic pipe is connected to a bottom connecting shell; another end of the telescopic pipe is connected to a transparent pipe, and an outer end of the transparent pipe is detachably connected to a top connecting shell; an outer wall of the transparent pipe is integrally formed with a first external thread, and a tail end of the transparent pipe is spirally c...