ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,281, issued on June 17, was assigned to Sandvik Mining and Construction Oy (Tampere, Finland).
"Piston guiding element, rock drilling machine and method" was invented by Antti Koskimaki (Tampere, Finland), Lars Kandelin (Tampere, Finland), Mikko Hamalainen (Tampere, Finland), Timo Kela (Tampere, Finland), Matti Viinikka (Tampere, Finland) and Esa Laakkola (Tampere, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A piston guiding element, rock drilling machine and method for supporting a front end portion of a percussion piston of a rock drilling machine. The piston guiding element includes a braking recess at its rear end. The element further...