ALEXANDRIA, Va., June 16 -- United States Patent no. 12,305,470, issued on May 20, was assigned to TALLY USA LLC (Houston).
"Plug with shuttle valve" was invented by Douglas Wayne Davison (Canyon Lake, Texas).
According to the abstract* released by the U.S. Patent & Trademark Office: "An improved plug with shuttle valve is disclosed. The improved plug has a bore in which a shuttle valve travels between stops in the bore. The traveling shuttle valve serves to reduce wellbore pressure across at least portions of the plug, thereby at least reducing the possibility of damage resulting from undue wellbore pressure and leak spots."
The patent was filed on June 1, 2023, under Application No. 18/327,186.
*For further information, including imag...