ALEXANDRIA, Va., June 2 -- United States Patent no. 12,644,173, issued on June 2, was assigned to NOVA Chemicals (International) S.A. (Fribourg, Switzerland).
"Anti-coking iron spinel surface" was invented by Evan Mah (Calgary, Canada), Vasily Simanzhenkov (Calgary, Canada), Leslie Benum (Red Deer, Canada), Hany Farag (Calgary, Canada) and Bolaji Olayiwola (Calgary, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "An anti-coking surface having a thickness up to 15 microns comprising from 15 to 50 wt. % of MnCr2O4 (for example manganochromite); from 15 to 25 wt. % of Cr0.23Mn0.08Ni0.69 (for example chromium manganese nickel); from 10 to 30 wt. % of Cr1.3Fe0.7O3 (for example chromium iron oxide); from 12 ...