ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,639, issued on April 7, was assigned to CORNING RESEARCH & DEVELOPMENT Corp. (Corning, N.Y.).

"Walk behind grinding tool with horizontally aligned guides and grinding drum" was invented by David Montalion Dupuis (Cedar Park, Texas), Cary Alan Kipke (Pflugerville, Texas) and Donald Kent Larson (Cedar Park, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed herein are walk behind grinding tools with horizontally aligned guides and grinding drum. One embodiment relates to a grinding tool with a pair of guides on opposing sides of a blade set of a grinding drum, where the pair of guides is configured to limit a grinding depth of the grinding...