ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,570, issued on March 18, was assigned to LiquidPower Specialty Products Inc. (Houston).
"Core-shell flow improver" was invented by Wayne R. Dreher (Germantown, Tenn.), Kenneth W. Smith (Tonkawa, Okla.), Stuart N. Milligan (Ponca City, Okla.), Timothy L. Burden (Ponca City, Okla.), William F. Harris (Palm Harbor, Fla.), Ray L. Johnston (Ponca City, Okla.), Wolfgang Klesse (Aschaffenburg, Germany), Gerold Schmitt (Aschaffenburg, Germany) and John Wey (East Brunswick, N.J.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A flow improver comprising a plurality of core-shell particles that can be formed by emulsion polymerization. The core of the core-she...