ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,815, issued on March 25, was assigned to Baker Hughes Oilfield Operations LLC (Houston).

"Earth-boring tools including rotatable cutting elements, rotatable cutting elements, and associated components and methods" was invented by Jon David Schroder (The Woodlands, Texas) and Gregory L. Ricks (Spring, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "A rotatable cutting element includes a stationary portion defining a cavity with an inner wall, the inner wall extending at an angle radially away from a longitudinal axis of the stationary portion and defining a retaining region. The rotatable cutting element further includes a rotatable portion hav...