ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,463, issued on Sept. 23, was assigned to DESMET USA INC. (Marietta, Ga.).

"Continuous oil recovery process from spent oily solid material" was invented by William Blake Hendrix (Kennesaw, Ga.), Timothy Kemper (Marietta, Ga.) and Marc Kellens (Mechelen-Muizen, Belgium).

According to the abstract* released by the U.S. Patent & Trademark Office: "A process for the treatment of oily hazardous solid materials such as for example spent bleaching earths. The process allows a safe and economical recovery of typically about 85% to 95% of the residual oil contained in such oily hazardous solid materials and transforms those ones into inert materials safe to transport, store, dispose of, o...