ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,413, issued on Dec. 30, was assigned to CYTEC INDUSTRIES INC. (Lawrence, N.J.).
"Method for making a di(aminoaryl)fluorene compound" was invented by Jonathan E. Meegan (Chester, Great Britain), Victor Maruani (Lyons, France), Vincent Schanen (Lyons, France) and Paul Cross (York, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for making a di(aminoaryl)fluorene compound that includes the steps of: (a) reacting a fluorenone compound according structure (I): with excess aminobenzene according to structure (II): wherein: each R1, R2, R3, R4, R12, and R13 is independently a group that is inert in the polymerization of epoxy compound...