ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,186, issued on June 17, was assigned to PREFERRED TECHNOLOGY LLC (Radnor, Pa.).

"Continuous mixers and methods of using the same" was invented by Spyridon Monastiriotis (Houston) and Anthony Paul Haddock (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "The disclosure provides continuous mixers and methods of using thereof including in the production of coated particles and proppants used in hydraulic fracturing techniques, by the application of coatings along the length of the continuous mixer through the use of a plurality of paddles configured within the continuous mixer."

The patent was filed on Nov. 2, 2018, under Application No. 16/178,...