ALEXANDRIA, Va., Aug. 25 -- United States Patent no. 12,716,548, issued on Aug. 25.
"Grease filling apparatus for manual grease gun" was invented by Duk-haeng Cho (Gyeonggi-do, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A grease filling apparatus for a manual grease includes a second valve means in the cylinder within the charging tank through the cover, a first valve means in the piston that is tightly inserted into the cylinder through the cover and that moves up and down, and a conventional manual grease gun detachably installed on the upper side of the piston, which is advantageous in terms of enabling fully filling the manual grease gun in a short time with the grease from the charging t...