ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,518, issued on March 31, was assigned to REPUBLIC OIL TOOLS LLC (Oklahoma City).

"Sleeve and plug system and method" was invented by Robert Hicks (Oklahoma City) and Josh Prather (Millsap, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "An artificial lift assembly and method relating thereto where a sleeve system is disposed above an electrical submersible pump. The sleeve system has a sliding sleeve at least partially carried within a ported case. The sliding sleeve blocks fluid flow through ports in the ported case. The sliding sleeve is restricted from movement relative to the ported case until a first predetermined pressure is applied to t...