ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,474,149, issued on Nov. 18, was assigned to DETNET SOUTH AFRICA (PTY) LTD (Johannesburg).
"Blasting system" was invented by Elmar Lennox Muller (Johannesburg) and Abraham Johannes Liebenberg (Johannesburg).
According to the abstract* released by the U.S. Patent & Trademark Office: "A blasting system which includes a blast site with a perimeter which surrounds the blast site, a plurality of spaced apart boreholes at the blast site, a plurality of detonator assemblies, each detonator assembly being positioned in a respective borehole, each detonator assembly including a respective receiver which is responsive to a magnetic signal transmitted from a control device and received by the re...