US Patent Issued to MINCON INTERNATIONAL on July 14 for "Hybrid hydraulic down-the-hole hammer" (Finnish Inventor)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,680,386, issued on July 14, was assigned to MINCON INTERNATIONAL Ltd. (Shannon, Ireland).

"Hybrid hydraulic down-the-hole hammer" was invented by Markku Keskiniva (Ylinen, Finland).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a closed-loop hydraulic down-the-hole hammer. The hammer comprises an elongate shaft and a piston having a central bore therethrough, the piston slidably mounted for reciprocal movement on the shaft and arranged to impact a percussion bit, wherein forward and rear drive chambers for the piston are disposed between the piston and the shaft and wherein the forward chamber is separated from the rear c...