ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,061, issued on May 27, was assigned to Graco Minnesota Inc. (Minneapolis).

"Fluid dispensing system having a piston rod and wear sleeve" was invented by Jeromy D. Horning (Albertville, Minn.) and Steve J. Wrobel (Rogers, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A piston includes a piston cap and a piston rod with the piston cap being removable from the piston rod body. The piston cap includes a cap body and a socket extending into the cap body. A mounting portion of the piston rod body extends into the socket of the cap body to connect the piston rod body to the piston cap. A wear sleeve is mounted on the piston rod."

The patent was fil...