ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,937, issued on March 18, was assigned to Mincon International Ltd. (Shannon, Ireland).
"Drilling device with fluid column resonator" 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 drilling device. The device comprises at least one drill rod, the or each drill rod having a first cylindrical wall defining an elongate chamber for receiving a working fluid to form a fluid column, the length of the fluid column being equal to a total length of the elongate chambers of the or each drill rod. The device also comprises a displacement excitation device arranged at a proxima...