ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,583, issued on March 18, was assigned to SOLVAY SPECIALTY POLYMERS ITALY S.P.A. (Bollate, Italy).

"Method of making mixture of polymers" was invented by Giovanni Fontana (Paderno Dugnano, Italy), Marco Galimberti (Bollate, Italy) and Vito Tortelli (Milan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a process for the synthesis of partially and fully fluorinated polyether (PFPE) polymers comprising cyclic moieties in the backbone chain, to PFPE polymers obtained therefrom and to the use of said PFPE polymers as intermediate compounds for the manufacture of additives for plastic and glass coating."

The patent was fi...