ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,442, issued on Sept. 23, was assigned to Cnergreen Corp. (Calgary, Canada).
"Nanoparticle-surfactant stabilized foams" was invented by Ali Telmadarreie (Calgary, Canada), Mingzhe Dong (Calgary, Canada) and Steven L. Bryant (Calgary, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "Stabilized foams are provided, adapted in particular for subterranean applications in hydrocarbon recovery operations. The foams are stabilized with surfactant-decorated nanoparticles, and the decoration of the nanoparticles with surfactant may be titrated to tune the stabilization of the foam."
The patent was filed on March 25, 2020, under Application No. 17/442,29...