ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,534,554, issued on Jan. 27, was assigned to ExxonMobil Chemical Patents Inc. (Baytown, Texas).

"Highly efficient C6 inert vent for gas phase polyethylene production" was invented by David J. Sandell (Sparks, Nev.), Corrine L. Brandl (Corpus Christi, Texas) and Jonathan R. Gallacher (Beaumont, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "Method of improving the efficiency of polyolefin production comprising: performing a reaction to yield (1) a product stream comprising a polyolefin, and (2) a purge stream, wherein the purge stream comprises unreacted monomers, inert impurities and saturated co-monomers; compressing the purge stream in a first st...