US Patent Issued to Sandvik Mining and Construction Tools, Sandvik Mining and Construction Australia on Aug. 12 for "Tension indicator for a rock bolt" (Australian Inventors)

ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,385,396, issued on Aug. 12, was assigned to Sandvik Mining and Construction Tools AB (Sandviken, Sweden) and Sandvik Mining and Construction Australia Pty Ltd (Milton, Australia).

"Tension indicator for a rock bolt" was invented by Steven Weaver (Heatherbrae, Australia), Osvaldo Vallati (Heatherbrae, Australia) and Mietek Rataj (Heatherbrae, Australia).

According to the abstract* released by the U.S. Patent & Trademark Office: "A tension indication device for a rock bolt includes a support washer, a cover member having a central hole for receiving a trailing portion of the rock bolt, and an indicator substance provided in a first space in the cover member or in a recess in the suppor...