ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,842, issued on April 29, was assigned to Sandvik Mining and Construction Tools AB (Sandviken, Sweden).
"Thread pitch" was invented by John Hammargren (Sandviken, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A female portion arranged to form part of a thread joint for a percussive drilling tool includes a mounting sleeve, wherein the mounting sleeve has at least one substantially cylindrical internally threaded section having a length, L1, a thread entrance located towards an axial end and a thread exit located towards the axial inner wall. The threaded section has a thread form including crests, roots, contact flanks, and non-contact flanks,...